4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/sched/signal.h>
25 #include <linux/list.h>
26 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/mempool.h>
32 #include <linux/delay.h>
33 #include <linux/completion.h>
34 #include <linux/kthread.h>
35 #include <linux/pagevec.h>
36 #include <linux/freezer.h>
37 #include <linux/namei.h>
38 #include <linux/uuid.h>
39 #include <linux/uaccess.h>
40 #include <asm/processor.h>
41 #include <linux/inet.h>
42 #include <linux/module.h>
43 #include <keys/user-type.h>
45 #include <linux/parser.h>
46 #include <linux/bvec.h>
49 #include "cifsproto.h"
50 #include "cifs_unicode.h"
51 #include "cifs_debug.h"
52 #include "cifs_fs_sb.h"
53 #include "dns_resolve.h"
56 #include "rfc1002pdu.h"
58 #include "smb2proto.h"
59 #include "smbdirect.h"
61 extern mempool_t *cifs_req_poolp;
62 extern bool disable_legacy_dialects;
64 /* FIXME: should these be tunable? */
65 #define TLINK_ERROR_EXPIRE (1 * HZ)
66 #define TLINK_IDLE_EXPIRE (600 * HZ)
69 /* Mount options that take no arguments */
70 Opt_user_xattr, Opt_nouser_xattr,
71 Opt_forceuid, Opt_noforceuid,
72 Opt_forcegid, Opt_noforcegid,
73 Opt_noblocksend, Opt_noautotune, Opt_nolease,
74 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
75 Opt_mapposix, Opt_nomapposix,
76 Opt_mapchars, Opt_nomapchars, Opt_sfu,
77 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
78 Opt_noposixpaths, Opt_nounix, Opt_unix,
81 Opt_handlecache, Opt_nohandlecache,
82 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
83 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
84 Opt_nohard, Opt_nosoft,
86 Opt_nostrictsync, Opt_strictsync,
87 Opt_serverino, Opt_noserverino,
88 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
89 Opt_acl, Opt_noacl, Opt_locallease,
90 Opt_sign, Opt_seal, Opt_noac,
91 Opt_fsc, Opt_mfsymlinks,
92 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
93 Opt_persistent, Opt_nopersistent,
94 Opt_resilient, Opt_noresilient,
95 Opt_domainauto, Opt_rdma,
97 /* Mount options which take numeric value */
98 Opt_backupuid, Opt_backupgid, Opt_uid,
99 Opt_cruid, Opt_gid, Opt_file_mode,
100 Opt_dirmode, Opt_port,
101 Opt_rsize, Opt_wsize, Opt_actimeo,
102 Opt_echo_interval, Opt_max_credits,
105 /* Mount options which take string value */
106 Opt_user, Opt_pass, Opt_ip,
107 Opt_domain, Opt_srcaddr, Opt_iocharset,
108 Opt_netbiosname, Opt_servern,
109 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
111 /* Mount options to be ignored */
114 /* Options which could be blank */
122 static const match_table_t cifs_mount_option_tokens = {
124 { Opt_user_xattr, "user_xattr" },
125 { Opt_nouser_xattr, "nouser_xattr" },
126 { Opt_forceuid, "forceuid" },
127 { Opt_noforceuid, "noforceuid" },
128 { Opt_forcegid, "forcegid" },
129 { Opt_noforcegid, "noforcegid" },
130 { Opt_noblocksend, "noblocksend" },
131 { Opt_noautotune, "noautotune" },
132 { Opt_nolease, "nolease" },
133 { Opt_hard, "hard" },
134 { Opt_soft, "soft" },
135 { Opt_perm, "perm" },
136 { Opt_noperm, "noperm" },
137 { Opt_mapchars, "mapchars" }, /* SFU style */
138 { Opt_nomapchars, "nomapchars" },
139 { Opt_mapposix, "mapposix" }, /* SFM style */
140 { Opt_nomapposix, "nomapposix" },
142 { Opt_nosfu, "nosfu" },
143 { Opt_nodfs, "nodfs" },
144 { Opt_posixpaths, "posixpaths" },
145 { Opt_noposixpaths, "noposixpaths" },
146 { Opt_nounix, "nounix" },
147 { Opt_nounix, "nolinux" },
148 { Opt_nounix, "noposix" },
149 { Opt_unix, "unix" },
150 { Opt_unix, "linux" },
151 { Opt_unix, "posix" },
152 { Opt_nocase, "nocase" },
153 { Opt_nocase, "ignorecase" },
155 { Opt_nobrl, "nobrl" },
156 { Opt_handlecache, "handlecache" },
157 { Opt_nohandlecache, "nohandlecache" },
158 { Opt_nobrl, "nolock" },
159 { Opt_forcemandatorylock, "forcemandatorylock" },
160 { Opt_forcemandatorylock, "forcemand" },
161 { Opt_setuids, "setuids" },
162 { Opt_nosetuids, "nosetuids" },
163 { Opt_setuidfromacl, "idsfromsid" },
164 { Opt_dynperm, "dynperm" },
165 { Opt_nodynperm, "nodynperm" },
166 { Opt_nohard, "nohard" },
167 { Opt_nosoft, "nosoft" },
168 { Opt_nointr, "nointr" },
169 { Opt_intr, "intr" },
170 { Opt_nostrictsync, "nostrictsync" },
171 { Opt_strictsync, "strictsync" },
172 { Opt_serverino, "serverino" },
173 { Opt_noserverino, "noserverino" },
174 { Opt_rwpidforward, "rwpidforward" },
175 { Opt_cifsacl, "cifsacl" },
176 { Opt_nocifsacl, "nocifsacl" },
178 { Opt_noacl, "noacl" },
179 { Opt_locallease, "locallease" },
180 { Opt_sign, "sign" },
181 { Opt_seal, "seal" },
182 { Opt_noac, "noac" },
184 { Opt_mfsymlinks, "mfsymlinks" },
185 { Opt_multiuser, "multiuser" },
186 { Opt_sloppy, "sloppy" },
187 { Opt_nosharesock, "nosharesock" },
188 { Opt_persistent, "persistenthandles"},
189 { Opt_nopersistent, "nopersistenthandles"},
190 { Opt_resilient, "resilienthandles"},
191 { Opt_noresilient, "noresilienthandles"},
192 { Opt_domainauto, "domainauto"},
195 { Opt_backupuid, "backupuid=%s" },
196 { Opt_backupgid, "backupgid=%s" },
197 { Opt_uid, "uid=%s" },
198 { Opt_cruid, "cruid=%s" },
199 { Opt_gid, "gid=%s" },
200 { Opt_file_mode, "file_mode=%s" },
201 { Opt_dirmode, "dirmode=%s" },
202 { Opt_dirmode, "dir_mode=%s" },
203 { Opt_port, "port=%s" },
204 { Opt_rsize, "rsize=%s" },
205 { Opt_wsize, "wsize=%s" },
206 { Opt_actimeo, "actimeo=%s" },
207 { Opt_echo_interval, "echo_interval=%s" },
208 { Opt_max_credits, "max_credits=%s" },
209 { Opt_snapshot, "snapshot=%s" },
211 { Opt_blank_user, "user=" },
212 { Opt_blank_user, "username=" },
213 { Opt_user, "user=%s" },
214 { Opt_user, "username=%s" },
215 { Opt_blank_pass, "pass=" },
216 { Opt_blank_pass, "password=" },
217 { Opt_pass, "pass=%s" },
218 { Opt_pass, "password=%s" },
219 { Opt_blank_ip, "ip=" },
220 { Opt_blank_ip, "addr=" },
222 { Opt_ip, "addr=%s" },
223 { Opt_ignore, "unc=%s" },
224 { Opt_ignore, "target=%s" },
225 { Opt_ignore, "path=%s" },
226 { Opt_domain, "dom=%s" },
227 { Opt_domain, "domain=%s" },
228 { Opt_domain, "workgroup=%s" },
229 { Opt_srcaddr, "srcaddr=%s" },
230 { Opt_ignore, "prefixpath=%s" },
231 { Opt_iocharset, "iocharset=%s" },
232 { Opt_netbiosname, "netbiosname=%s" },
233 { Opt_servern, "servern=%s" },
234 { Opt_ver, "ver=%s" },
235 { Opt_vers, "vers=%s" },
236 { Opt_sec, "sec=%s" },
237 { Opt_cache, "cache=%s" },
239 { Opt_ignore, "cred" },
240 { Opt_ignore, "credentials" },
241 { Opt_ignore, "cred=%s" },
242 { Opt_ignore, "credentials=%s" },
243 { Opt_ignore, "guest" },
244 { Opt_ignore, "rw" },
245 { Opt_ignore, "ro" },
246 { Opt_ignore, "suid" },
247 { Opt_ignore, "nosuid" },
248 { Opt_ignore, "exec" },
249 { Opt_ignore, "noexec" },
250 { Opt_ignore, "nodev" },
251 { Opt_ignore, "noauto" },
252 { Opt_ignore, "dev" },
253 { Opt_ignore, "mand" },
254 { Opt_ignore, "nomand" },
255 { Opt_ignore, "_netdev" },
261 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
262 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
263 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
264 Opt_sec_ntlmv2i, Opt_sec_lanman,
270 static const match_table_t cifs_secflavor_tokens = {
271 { Opt_sec_krb5, "krb5" },
272 { Opt_sec_krb5i, "krb5i" },
273 { Opt_sec_krb5p, "krb5p" },
274 { Opt_sec_ntlmsspi, "ntlmsspi" },
275 { Opt_sec_ntlmssp, "ntlmssp" },
276 { Opt_ntlm, "ntlm" },
277 { Opt_sec_ntlmi, "ntlmi" },
278 { Opt_sec_ntlmv2, "nontlm" },
279 { Opt_sec_ntlmv2, "ntlmv2" },
280 { Opt_sec_ntlmv2i, "ntlmv2i" },
281 { Opt_sec_lanman, "lanman" },
282 { Opt_sec_none, "none" },
284 { Opt_sec_err, NULL }
295 static const match_table_t cifs_cacheflavor_tokens = {
296 { Opt_cache_loose, "loose" },
297 { Opt_cache_strict, "strict" },
298 { Opt_cache_none, "none" },
299 { Opt_cache_err, NULL }
302 static const match_table_t cifs_smb_version_tokens = {
303 { Smb_1, SMB1_VERSION_STRING },
304 { Smb_20, SMB20_VERSION_STRING},
305 { Smb_21, SMB21_VERSION_STRING },
306 { Smb_30, SMB30_VERSION_STRING },
307 { Smb_302, SMB302_VERSION_STRING },
308 { Smb_311, SMB311_VERSION_STRING },
309 { Smb_311, ALT_SMB311_VERSION_STRING },
310 { Smb_3any, SMB3ANY_VERSION_STRING },
311 { Smb_default, SMBDEFAULT_VERSION_STRING },
312 { Smb_version_err, NULL }
315 static int ip_connect(struct TCP_Server_Info *server);
316 static int generic_ip_connect(struct TCP_Server_Info *server);
317 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
318 static void cifs_prune_tlinks(struct work_struct *work);
319 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
320 const char *devname, bool is_smb3);
323 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
324 * get their ip addresses changed at some point.
326 * This should be called with server->srv_mutex held.
328 #ifdef CONFIG_CIFS_DFS_UPCALL
329 static int reconn_set_ipaddr(struct TCP_Server_Info *server)
333 char *unc, *ipaddr = NULL;
335 if (!server->hostname)
338 len = strlen(server->hostname) + 3;
340 unc = kmalloc(len, GFP_KERNEL);
342 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
345 snprintf(unc, len, "\\\\%s", server->hostname);
347 rc = dns_resolve_server_name_to_ip(unc, &ipaddr);
351 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
352 __func__, server->hostname, rc);
356 spin_lock(&cifs_tcp_ses_lock);
357 rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
359 spin_unlock(&cifs_tcp_ses_lock);
365 static inline int reconn_set_ipaddr(struct TCP_Server_Info *server)
372 * cifs tcp session reconnection
374 * mark tcp session as reconnecting so temporarily locked
375 * mark all smb sessions as reconnecting for tcp session
376 * reconnect tcp session
377 * wake up waiters on reconnection? - (not needed currently)
380 cifs_reconnect(struct TCP_Server_Info *server)
383 struct list_head *tmp, *tmp2;
384 struct cifs_ses *ses;
385 struct cifs_tcon *tcon;
386 struct mid_q_entry *mid_entry;
387 struct list_head retry_list;
389 spin_lock(&GlobalMid_Lock);
390 if (server->tcpStatus == CifsExiting) {
391 /* the demux thread will exit normally
392 next time through the loop */
393 spin_unlock(&GlobalMid_Lock);
396 server->tcpStatus = CifsNeedReconnect;
397 spin_unlock(&GlobalMid_Lock);
399 server->max_read = 0;
401 cifs_dbg(FYI, "Reconnecting tcp session\n");
402 trace_smb3_reconnect(server->CurrentMid, server->hostname);
404 /* before reconnecting the tcp session, mark the smb session (uid)
405 and the tid bad so they are not used until reconnected */
406 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
408 spin_lock(&cifs_tcp_ses_lock);
409 list_for_each(tmp, &server->smb_ses_list) {
410 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
411 ses->need_reconnect = true;
412 list_for_each(tmp2, &ses->tcon_list) {
413 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
414 tcon->need_reconnect = true;
417 ses->tcon_ipc->need_reconnect = true;
419 spin_unlock(&cifs_tcp_ses_lock);
421 /* do not want to be sending data on a socket we are freeing */
422 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
423 mutex_lock(&server->srv_mutex);
424 if (server->ssocket) {
425 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
426 server->ssocket->state, server->ssocket->flags);
427 kernel_sock_shutdown(server->ssocket, SHUT_WR);
428 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
429 server->ssocket->state, server->ssocket->flags);
430 sock_release(server->ssocket);
431 server->ssocket = NULL;
433 server->sequence_number = 0;
434 server->session_estab = false;
435 kfree(server->session_key.response);
436 server->session_key.response = NULL;
437 server->session_key.len = 0;
438 server->lstrp = jiffies;
440 /* mark submitted MIDs for retry and issue callback */
441 INIT_LIST_HEAD(&retry_list);
442 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
443 spin_lock(&GlobalMid_Lock);
444 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
445 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
446 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
447 mid_entry->mid_state = MID_RETRY_NEEDED;
448 list_move(&mid_entry->qhead, &retry_list);
450 spin_unlock(&GlobalMid_Lock);
451 mutex_unlock(&server->srv_mutex);
453 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
454 list_for_each_safe(tmp, tmp2, &retry_list) {
455 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
456 list_del_init(&mid_entry->qhead);
457 mid_entry->callback(mid_entry);
463 /* we should try only the port we connected to before */
464 mutex_lock(&server->srv_mutex);
465 if (cifs_rdma_enabled(server))
466 rc = smbd_reconnect(server);
468 rc = generic_ip_connect(server);
470 cifs_dbg(FYI, "reconnect error %d\n", rc);
471 rc = reconn_set_ipaddr(server);
473 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
476 mutex_unlock(&server->srv_mutex);
479 atomic_inc(&tcpSesReconnectCount);
480 spin_lock(&GlobalMid_Lock);
481 if (server->tcpStatus != CifsExiting)
482 server->tcpStatus = CifsNeedNegotiate;
483 spin_unlock(&GlobalMid_Lock);
484 mutex_unlock(&server->srv_mutex);
486 } while (server->tcpStatus == CifsNeedReconnect);
488 if (server->tcpStatus == CifsNeedNegotiate)
489 mod_delayed_work(cifsiod_wq, &server->echo, 0);
495 cifs_echo_request(struct work_struct *work)
498 struct TCP_Server_Info *server = container_of(work,
499 struct TCP_Server_Info, echo.work);
500 unsigned long echo_interval;
503 * If we need to renegotiate, set echo interval to zero to
504 * immediately call echo service where we can renegotiate.
506 if (server->tcpStatus == CifsNeedNegotiate)
509 echo_interval = server->echo_interval;
512 * We cannot send an echo if it is disabled.
513 * Also, no need to ping if we got a response recently.
516 if (server->tcpStatus == CifsNeedReconnect ||
517 server->tcpStatus == CifsExiting ||
518 server->tcpStatus == CifsNew ||
519 (server->ops->can_echo && !server->ops->can_echo(server)) ||
520 time_before(jiffies, server->lstrp + echo_interval - HZ))
523 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
525 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
529 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
533 allocate_buffers(struct TCP_Server_Info *server)
535 if (!server->bigbuf) {
536 server->bigbuf = (char *)cifs_buf_get();
537 if (!server->bigbuf) {
538 cifs_dbg(VFS, "No memory for large SMB response\n");
540 /* retry will check if exiting */
543 } else if (server->large_buf) {
544 /* we are reusing a dirty large buf, clear its start */
545 memset(server->bigbuf, 0, HEADER_SIZE(server));
548 if (!server->smallbuf) {
549 server->smallbuf = (char *)cifs_small_buf_get();
550 if (!server->smallbuf) {
551 cifs_dbg(VFS, "No memory for SMB response\n");
553 /* retry will check if exiting */
556 /* beginning of smb buffer is cleared in our buf_get */
558 /* if existing small buf clear beginning */
559 memset(server->smallbuf, 0, HEADER_SIZE(server));
566 server_unresponsive(struct TCP_Server_Info *server)
569 * We need to wait 3 echo intervals to make sure we handle such
571 * 1s client sends a normal SMB request
572 * 3s client gets a response
573 * 30s echo workqueue job pops, and decides we got a response recently
574 * and don't need to send another
576 * 65s kernel_recvmsg times out, and we see that we haven't gotten
577 * a response in >60s.
579 if ((server->tcpStatus == CifsGood ||
580 server->tcpStatus == CifsNeedNegotiate) &&
581 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
582 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
583 server->hostname, (3 * server->echo_interval) / HZ);
584 cifs_reconnect(server);
585 wake_up(&server->response_q);
593 zero_credits(struct TCP_Server_Info *server)
597 spin_lock(&server->req_lock);
598 val = server->credits + server->echo_credits + server->oplock_credits;
599 if (server->in_flight == 0 && val == 0) {
600 spin_unlock(&server->req_lock);
603 spin_unlock(&server->req_lock);
608 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
613 smb_msg->msg_control = NULL;
614 smb_msg->msg_controllen = 0;
616 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
619 /* reconnect if no credits and no requests in flight */
620 if (zero_credits(server)) {
621 cifs_reconnect(server);
622 return -ECONNABORTED;
625 if (server_unresponsive(server))
626 return -ECONNABORTED;
627 if (cifs_rdma_enabled(server) && server->smbd_conn)
628 length = smbd_recv(server->smbd_conn, smb_msg);
630 length = sock_recvmsg(server->ssocket, smb_msg, 0);
632 if (server->tcpStatus == CifsExiting)
635 if (server->tcpStatus == CifsNeedReconnect) {
636 cifs_reconnect(server);
637 return -ECONNABORTED;
640 if (length == -ERESTARTSYS ||
644 * Minimum sleep to prevent looping, allowing socket
645 * to clear and app threads to set tcpStatus
646 * CifsNeedReconnect if server hung.
648 usleep_range(1000, 2000);
654 cifs_dbg(FYI, "Received no data or error: %d\n", length);
655 cifs_reconnect(server);
656 return -ECONNABORTED;
663 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
664 unsigned int to_read)
666 struct msghdr smb_msg;
667 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
668 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
670 return cifs_readv_from_socket(server, &smb_msg);
674 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
675 unsigned int page_offset, unsigned int to_read)
677 struct msghdr smb_msg;
678 struct bio_vec bv = {
679 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
680 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
681 return cifs_readv_from_socket(server, &smb_msg);
685 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
688 * The first byte big endian of the length field,
689 * is actually not part of the length but the type
690 * with the most common, zero, as regular data.
693 case RFC1002_SESSION_MESSAGE:
694 /* Regular SMB response */
696 case RFC1002_SESSION_KEEP_ALIVE:
697 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
699 case RFC1002_POSITIVE_SESSION_RESPONSE:
700 cifs_dbg(FYI, "RFC 1002 positive session response\n");
702 case RFC1002_NEGATIVE_SESSION_RESPONSE:
704 * We get this from Windows 98 instead of an error on
705 * SMB negprot response.
707 cifs_dbg(FYI, "RFC 1002 negative session response\n");
708 /* give server a second to clean up */
711 * Always try 445 first on reconnect since we get NACK
712 * on some if we ever connected to port 139 (the NACK
713 * is since we do not begin with RFC1001 session
716 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
717 cifs_reconnect(server);
718 wake_up(&server->response_q);
721 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
722 cifs_reconnect(server);
729 dequeue_mid(struct mid_q_entry *mid, bool malformed)
731 #ifdef CONFIG_CIFS_STATS2
732 mid->when_received = jiffies;
734 spin_lock(&GlobalMid_Lock);
736 mid->mid_state = MID_RESPONSE_RECEIVED;
738 mid->mid_state = MID_RESPONSE_MALFORMED;
740 * Trying to handle/dequeue a mid after the send_recv()
741 * function has finished processing it is a bug.
743 if (mid->mid_flags & MID_DELETED)
744 printk_once(KERN_WARNING
745 "trying to dequeue a deleted mid\n");
747 list_del_init(&mid->qhead);
748 spin_unlock(&GlobalMid_Lock);
752 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
753 char *buf, int malformed)
755 if (server->ops->check_trans2 &&
756 server->ops->check_trans2(mid, server, buf, malformed))
759 mid->large_buf = server->large_buf;
760 /* Was previous buf put in mpx struct for multi-rsp? */
761 if (!mid->multiRsp) {
762 /* smb buffer will be freed by user thread */
763 if (server->large_buf)
764 server->bigbuf = NULL;
766 server->smallbuf = NULL;
768 dequeue_mid(mid, malformed);
771 static void clean_demultiplex_info(struct TCP_Server_Info *server)
775 /* take it off the list, if it's not already */
776 spin_lock(&cifs_tcp_ses_lock);
777 list_del_init(&server->tcp_ses_list);
778 spin_unlock(&cifs_tcp_ses_lock);
780 cancel_delayed_work_sync(&server->echo);
782 spin_lock(&GlobalMid_Lock);
783 server->tcpStatus = CifsExiting;
784 spin_unlock(&GlobalMid_Lock);
785 wake_up_all(&server->response_q);
787 /* check if we have blocked requests that need to free */
788 spin_lock(&server->req_lock);
789 if (server->credits <= 0)
791 spin_unlock(&server->req_lock);
793 * Although there should not be any requests blocked on this queue it
794 * can not hurt to be paranoid and try to wake up requests that may
795 * haven been blocked when more than 50 at time were on the wire to the
796 * same server - they now will see the session is in exit state and get
797 * out of SendReceive.
799 wake_up_all(&server->request_q);
800 /* give those requests time to exit */
802 if (cifs_rdma_enabled(server) && server->smbd_conn) {
803 smbd_destroy(server->smbd_conn);
804 server->smbd_conn = NULL;
806 if (server->ssocket) {
807 sock_release(server->ssocket);
808 server->ssocket = NULL;
811 if (!list_empty(&server->pending_mid_q)) {
812 struct list_head dispose_list;
813 struct mid_q_entry *mid_entry;
814 struct list_head *tmp, *tmp2;
816 INIT_LIST_HEAD(&dispose_list);
817 spin_lock(&GlobalMid_Lock);
818 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
819 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
820 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
821 mid_entry->mid_state = MID_SHUTDOWN;
822 list_move(&mid_entry->qhead, &dispose_list);
824 spin_unlock(&GlobalMid_Lock);
826 /* now walk dispose list and issue callbacks */
827 list_for_each_safe(tmp, tmp2, &dispose_list) {
828 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
829 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
830 list_del_init(&mid_entry->qhead);
831 mid_entry->callback(mid_entry);
833 /* 1/8th of sec is more than enough time for them to exit */
837 if (!list_empty(&server->pending_mid_q)) {
839 * mpx threads have not exited yet give them at least the smb
840 * send timeout time for long ops.
842 * Due to delays on oplock break requests, we need to wait at
843 * least 45 seconds before giving up on a request getting a
844 * response and going ahead and killing cifsd.
846 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
849 * If threads still have not exited they are probably never
850 * coming home not much else we can do but free the memory.
854 kfree(server->hostname);
857 length = atomic_dec_return(&tcpSesAllocCount);
859 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
863 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
866 char *buf = server->smallbuf;
867 unsigned int pdu_length = server->pdu_size;
869 /* make sure this will fit in a large buffer */
870 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
871 server->vals->header_preamble_size) {
872 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
873 cifs_reconnect(server);
874 wake_up(&server->response_q);
875 return -ECONNABORTED;
878 /* switch to large buffer if too big for a small one */
879 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
880 server->large_buf = true;
881 memcpy(server->bigbuf, buf, server->total_read);
882 buf = server->bigbuf;
885 /* now read the rest */
886 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
887 pdu_length - HEADER_SIZE(server) + 1
888 + server->vals->header_preamble_size);
892 server->total_read += length;
894 dump_smb(buf, server->total_read);
896 return cifs_handle_standard(server, mid);
900 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
902 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
906 * We know that we received enough to get to the MID as we
907 * checked the pdu_length earlier. Now check to see
908 * if the rest of the header is OK. We borrow the length
909 * var for the rest of the loop to avoid a new stack var.
911 * 48 bytes is enough to display the header and a little bit
912 * into the payload for debugging purposes.
914 length = server->ops->check_message(buf, server->total_read, server);
916 cifs_dump_mem("Bad SMB: ", buf,
917 min_t(unsigned int, server->total_read, 48));
919 if (server->ops->is_session_expired &&
920 server->ops->is_session_expired(buf)) {
921 cifs_reconnect(server);
922 wake_up(&server->response_q);
926 if (server->ops->is_status_pending &&
927 server->ops->is_status_pending(buf, server, length))
933 handle_mid(mid, server, buf, length);
938 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
940 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
943 * SMB1 does not use credits.
945 if (server->vals->header_preamble_size)
948 if (shdr->CreditRequest) {
949 spin_lock(&server->req_lock);
950 server->credits += le16_to_cpu(shdr->CreditRequest);
951 spin_unlock(&server->req_lock);
952 wake_up(&server->request_q);
958 cifs_demultiplex_thread(void *p)
960 int i, num_mids, length;
961 struct TCP_Server_Info *server = p;
962 unsigned int pdu_length;
963 unsigned int next_offset;
965 struct task_struct *task_to_wake = NULL;
966 struct mid_q_entry *mids[MAX_COMPOUND];
967 char *bufs[MAX_COMPOUND];
969 current->flags |= PF_MEMALLOC;
970 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
972 length = atomic_inc_return(&tcpSesAllocCount);
974 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
977 allow_kernel_signal(SIGKILL);
978 while (server->tcpStatus != CifsExiting) {
982 if (!allocate_buffers(server))
985 server->large_buf = false;
986 buf = server->smallbuf;
987 pdu_length = 4; /* enough to get RFC1001 header */
989 length = cifs_read_from_socket(server, buf, pdu_length);
993 if (server->vals->header_preamble_size == 0)
994 server->total_read = 0;
996 server->total_read = length;
999 * The right amount was read from socket - 4 bytes,
1000 * so we can now interpret the length field.
1002 pdu_length = get_rfc1002_length(buf);
1004 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1005 if (!is_smb_response(server, buf[0]))
1008 server->pdu_size = pdu_length;
1010 /* make sure we have enough to get to the MID */
1011 if (server->pdu_size < HEADER_SIZE(server) - 1 -
1012 server->vals->header_preamble_size) {
1013 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
1015 cifs_reconnect(server);
1016 wake_up(&server->response_q);
1020 /* read down to the MID */
1021 length = cifs_read_from_socket(server,
1022 buf + server->vals->header_preamble_size,
1023 HEADER_SIZE(server) - 1
1024 - server->vals->header_preamble_size);
1027 server->total_read += length;
1029 if (server->ops->next_header) {
1030 next_offset = server->ops->next_header(buf);
1032 server->pdu_size = next_offset;
1035 memset(mids, 0, sizeof(mids));
1036 memset(bufs, 0, sizeof(bufs));
1039 if (server->ops->is_transform_hdr &&
1040 server->ops->receive_transform &&
1041 server->ops->is_transform_hdr(buf)) {
1042 length = server->ops->receive_transform(server,
1047 mids[0] = server->ops->find_mid(server, buf);
1051 if (!mids[0] || !mids[0]->receive)
1052 length = standard_receive3(server, mids[0]);
1054 length = mids[0]->receive(server, mids[0]);
1058 for (i = 0; i < num_mids; i++)
1060 cifs_mid_q_entry_release(mids[i]);
1064 if (server->large_buf)
1065 buf = server->bigbuf;
1068 server->lstrp = jiffies;
1070 for (i = 0; i < num_mids; i++) {
1071 if (mids[i] != NULL) {
1072 mids[i]->resp_buf_size = server->pdu_size;
1073 if ((mids[i]->mid_flags & MID_WAIT_CANCELLED) &&
1074 mids[i]->mid_state == MID_RESPONSE_RECEIVED &&
1075 server->ops->handle_cancelled_mid)
1076 server->ops->handle_cancelled_mid(
1080 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1081 mids[i]->callback(mids[i]);
1083 cifs_mid_q_entry_release(mids[i]);
1084 } else if (server->ops->is_oplock_break &&
1085 server->ops->is_oplock_break(bufs[i],
1087 smb2_add_credits_from_hdr(bufs[i], server);
1088 cifs_dbg(FYI, "Received oplock break\n");
1090 cifs_dbg(VFS, "No task to wake, unknown frame "
1091 "received! NumMids %d\n",
1092 atomic_read(&midCount));
1093 cifs_dump_mem("Received Data is: ", bufs[i],
1094 HEADER_SIZE(server));
1095 #ifdef CONFIG_CIFS_DEBUG2
1096 if (server->ops->dump_detail)
1097 server->ops->dump_detail(bufs[i],
1099 smb2_add_credits_from_hdr(bufs[i], server);
1100 cifs_dump_mids(server);
1101 #endif /* CIFS_DEBUG2 */
1105 if (pdu_length > server->pdu_size) {
1106 if (!allocate_buffers(server))
1108 pdu_length -= server->pdu_size;
1109 server->total_read = 0;
1110 server->large_buf = false;
1111 buf = server->smallbuf;
1114 } /* end while !EXITING */
1116 /* buffer usually freed in free_mid - need to free it here on exit */
1117 cifs_buf_release(server->bigbuf);
1118 if (server->smallbuf) /* no sense logging a debug message if NULL */
1119 cifs_small_buf_release(server->smallbuf);
1121 task_to_wake = xchg(&server->tsk, NULL);
1122 clean_demultiplex_info(server);
1124 /* if server->tsk was NULL then wait for a signal before exiting */
1125 if (!task_to_wake) {
1126 set_current_state(TASK_INTERRUPTIBLE);
1127 while (!signal_pending(current)) {
1129 set_current_state(TASK_INTERRUPTIBLE);
1131 set_current_state(TASK_RUNNING);
1134 module_put_and_exit(0);
1137 /* extract the host portion of the UNC string */
1139 extract_hostname(const char *unc)
1145 /* skip double chars at beginning of string */
1146 /* BB: check validity of these bytes? */
1149 /* delimiter between hostname and sharename is always '\\' now */
1150 delim = strchr(src, '\\');
1152 return ERR_PTR(-EINVAL);
1155 dst = kmalloc((len + 1), GFP_KERNEL);
1157 return ERR_PTR(-ENOMEM);
1159 memcpy(dst, src, len);
1165 static int get_option_ul(substring_t args[], unsigned long *option)
1170 string = match_strdup(args);
1173 rc = kstrtoul(string, 0, option);
1179 static int get_option_uid(substring_t args[], kuid_t *result)
1181 unsigned long value;
1185 rc = get_option_ul(args, &value);
1189 uid = make_kuid(current_user_ns(), value);
1190 if (!uid_valid(uid))
1197 static int get_option_gid(substring_t args[], kgid_t *result)
1199 unsigned long value;
1203 rc = get_option_ul(args, &value);
1207 gid = make_kgid(current_user_ns(), value);
1208 if (!gid_valid(gid))
1215 static int cifs_parse_security_flavors(char *value,
1216 struct smb_vol *vol)
1219 substring_t args[MAX_OPT_ARGS];
1222 * With mount options, the last one should win. Reset any existing
1223 * settings back to default.
1225 vol->sectype = Unspecified;
1228 switch (match_token(value, cifs_secflavor_tokens, args)) {
1230 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1236 vol->sectype = Kerberos;
1238 case Opt_sec_ntlmsspi:
1241 case Opt_sec_ntlmssp:
1242 vol->sectype = RawNTLMSSP;
1248 vol->sectype = NTLM;
1250 case Opt_sec_ntlmv2i:
1253 case Opt_sec_ntlmv2:
1254 vol->sectype = NTLMv2;
1256 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1257 case Opt_sec_lanman:
1258 vol->sectype = LANMAN;
1265 cifs_dbg(VFS, "bad security option: %s\n", value);
1273 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1275 substring_t args[MAX_OPT_ARGS];
1277 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1278 case Opt_cache_loose:
1279 vol->direct_io = false;
1280 vol->strict_io = false;
1282 case Opt_cache_strict:
1283 vol->direct_io = false;
1284 vol->strict_io = true;
1286 case Opt_cache_none:
1287 vol->direct_io = true;
1288 vol->strict_io = false;
1291 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1298 cifs_parse_smb_version(char *value, struct smb_vol *vol, bool is_smb3)
1300 substring_t args[MAX_OPT_ARGS];
1302 switch (match_token(value, cifs_smb_version_tokens, args)) {
1303 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1305 if (disable_legacy_dialects) {
1306 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1310 cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
1313 vol->ops = &smb1_operations;
1314 vol->vals = &smb1_values;
1317 if (disable_legacy_dialects) {
1318 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1322 cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
1325 vol->ops = &smb20_operations;
1326 vol->vals = &smb20_values;
1330 cifs_dbg(VFS, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
1333 cifs_dbg(VFS, "vers=2.0 mount not permitted when legacy dialects disabled\n");
1335 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
1337 vol->ops = &smb21_operations;
1338 vol->vals = &smb21_values;
1341 vol->ops = &smb30_operations;
1342 vol->vals = &smb30_values;
1345 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1346 vol->vals = &smb302_values;
1349 vol->ops = &smb311_operations;
1350 vol->vals = &smb311_values;
1353 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1354 vol->vals = &smb3any_values;
1357 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1358 vol->vals = &smbdefault_values;
1361 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1368 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1369 * fields with the result. Returns 0 on success and an error otherwise.
1372 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1375 const char *delims = "/\\";
1378 if (unlikely(!devname || !*devname)) {
1379 cifs_dbg(VFS, "Device name not specified.\n");
1383 /* make sure we have a valid UNC double delimiter prefix */
1384 len = strspn(devname, delims);
1388 /* find delimiter between host and sharename */
1389 pos = strpbrk(devname + 2, delims);
1393 /* skip past delimiter */
1396 /* now go until next delimiter or end of string */
1397 len = strcspn(pos, delims);
1399 /* move "pos" up to delimiter or NULL */
1401 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1405 convert_delimiter(vol->UNC, '\\');
1407 /* skip any delimiter */
1408 if (*pos == '/' || *pos == '\\')
1411 /* If pos is NULL then no prepath */
1415 vol->prepath = kstrdup(pos, GFP_KERNEL);
1423 cifs_parse_mount_options(const char *mountdata, const char *devname,
1424 struct smb_vol *vol, bool is_smb3)
1427 char *mountdata_copy = NULL, *options;
1428 unsigned int temp_len, i, j;
1430 short int override_uid = -1;
1431 short int override_gid = -1;
1432 bool uid_specified = false;
1433 bool gid_specified = false;
1434 bool sloppy = false;
1435 char *invalid = NULL;
1436 char *nodename = utsname()->nodename;
1437 char *string = NULL;
1438 char *tmp_end, *value;
1440 bool got_ip = false;
1441 bool got_version = false;
1442 unsigned short port = 0;
1443 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1447 delim = separator[0];
1449 /* ensure we always start with zeroed-out smb_vol */
1450 memset(vol, 0, sizeof(*vol));
1453 * does not have to be perfect mapping since field is
1454 * informational, only used for servers that do not support
1455 * port 445 and it can be overridden at mount time
1457 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1458 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1459 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1461 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1462 /* null target name indicates to use *SMBSERVR default called name
1463 if we end up sending RFC1001 session initialize */
1464 vol->target_rfc1001_name[0] = 0;
1465 vol->cred_uid = current_uid();
1466 vol->linux_uid = current_uid();
1467 vol->linux_gid = current_gid();
1470 * default to SFM style remapping of seven reserved characters
1471 * unless user overrides it or we negotiate CIFS POSIX where
1472 * it is unnecessary. Can not simultaneously use more than one mapping
1473 * since then readdir could list files that open could not open
1477 /* default to only allowing write access to owner of the mount */
1478 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1480 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1481 /* default is always to request posix paths. */
1482 vol->posix_paths = 1;
1483 /* default to using server inode numbers where available */
1484 vol->server_ino = 1;
1486 /* default is to use strict cifs caching semantics */
1487 vol->strict_io = true;
1489 vol->actimeo = CIFS_DEF_ACTIMEO;
1491 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1492 vol->ops = &smb30_operations;
1493 vol->vals = &smbdefault_values;
1495 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1498 goto cifs_parse_mount_err;
1500 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1501 if (!mountdata_copy)
1502 goto cifs_parse_mount_err;
1504 options = mountdata_copy;
1505 end = options + strlen(options);
1507 if (strncmp(options, "sep=", 4) == 0) {
1508 if (options[4] != 0) {
1509 separator[0] = options[4];
1512 cifs_dbg(FYI, "Null separator not allowed\n");
1515 vol->backupuid_specified = false; /* no backup intent for a user */
1516 vol->backupgid_specified = false; /* no backup intent for a group */
1518 switch (cifs_parse_devname(devname, vol)) {
1522 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1523 goto cifs_parse_mount_err;
1525 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1526 goto cifs_parse_mount_err;
1528 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1529 goto cifs_parse_mount_err;
1532 while ((data = strsep(&options, separator)) != NULL) {
1533 substring_t args[MAX_OPT_ARGS];
1534 unsigned long option;
1540 token = match_token(data, cifs_mount_option_tokens, args);
1544 /* Ingnore the following */
1548 /* Boolean values */
1549 case Opt_user_xattr:
1552 case Opt_nouser_xattr:
1558 case Opt_noforceuid:
1564 case Opt_noforcegid:
1567 case Opt_noblocksend:
1568 vol->noblocksnd = 1;
1570 case Opt_noautotune:
1571 vol->noautotune = 1;
1589 vol->sfu_remap = true;
1590 vol->remap = false; /* disable SFM mapping */
1592 case Opt_nomapchars:
1593 vol->sfu_remap = false;
1597 vol->sfu_remap = false; /* disable SFU mapping */
1599 case Opt_nomapposix:
1611 case Opt_posixpaths:
1612 vol->posix_paths = 1;
1614 case Opt_noposixpaths:
1615 vol->posix_paths = 0;
1620 "conflicting unix mount options\n");
1621 vol->no_linux_ext = 1;
1624 if (vol->no_linux_ext)
1626 "conflicting unix mount options\n");
1638 * turn off mandatory locking in mode
1639 * if remote locking is turned off since the
1640 * local vfs will do advisory
1642 if (vol->file_mode ==
1643 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1644 vol->file_mode = S_IALLUGO;
1646 case Opt_nohandlecache:
1647 vol->nohandlecache = 1;
1649 case Opt_handlecache:
1650 vol->nohandlecache = 0;
1652 case Opt_forcemandatorylock:
1661 case Opt_setuidfromacl:
1662 vol->setuidfromacl = 1;
1665 vol->dynperm = true;
1668 vol->dynperm = false;
1682 case Opt_nostrictsync:
1683 vol->nostrictsync = 1;
1685 case Opt_strictsync:
1686 vol->nostrictsync = 0;
1689 vol->server_ino = 1;
1691 case Opt_noserverino:
1692 vol->server_ino = 0;
1694 case Opt_rwpidforward:
1695 vol->rwpidforward = 1;
1704 vol->no_psx_acl = 0;
1707 vol->no_psx_acl = 1;
1709 case Opt_locallease:
1710 vol->local_lease = 1;
1716 /* we do not do the following in secFlags because seal
1717 * is a per tree connection (mount) not a per socket
1718 * or per-smb connection option in the protocol
1719 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1724 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1727 #ifndef CONFIG_CIFS_FSCACHE
1728 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1729 goto cifs_parse_mount_err;
1733 case Opt_mfsymlinks:
1734 vol->mfsymlinks = true;
1737 vol->multiuser = true;
1742 case Opt_nosharesock:
1743 vol->nosharesock = true;
1745 case Opt_nopersistent:
1746 vol->nopersistent = true;
1747 if (vol->persistent) {
1749 "persistenthandles mount options conflict\n");
1750 goto cifs_parse_mount_err;
1753 case Opt_persistent:
1754 vol->persistent = true;
1755 if ((vol->nopersistent) || (vol->resilient)) {
1757 "persistenthandles mount options conflict\n");
1758 goto cifs_parse_mount_err;
1762 vol->resilient = true;
1763 if (vol->persistent) {
1765 "persistenthandles mount options conflict\n");
1766 goto cifs_parse_mount_err;
1769 case Opt_noresilient:
1770 vol->resilient = false; /* already the default */
1772 case Opt_domainauto:
1773 vol->domainauto = true;
1779 /* Numeric Values */
1781 if (get_option_uid(args, &vol->backupuid)) {
1782 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1784 goto cifs_parse_mount_err;
1786 vol->backupuid_specified = true;
1789 if (get_option_gid(args, &vol->backupgid)) {
1790 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1792 goto cifs_parse_mount_err;
1794 vol->backupgid_specified = true;
1797 if (get_option_uid(args, &vol->linux_uid)) {
1798 cifs_dbg(VFS, "%s: Invalid uid value\n",
1800 goto cifs_parse_mount_err;
1802 uid_specified = true;
1805 if (get_option_uid(args, &vol->cred_uid)) {
1806 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1808 goto cifs_parse_mount_err;
1812 if (get_option_gid(args, &vol->linux_gid)) {
1813 cifs_dbg(VFS, "%s: Invalid gid value\n",
1815 goto cifs_parse_mount_err;
1817 gid_specified = true;
1820 if (get_option_ul(args, &option)) {
1821 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1823 goto cifs_parse_mount_err;
1825 vol->file_mode = option;
1828 if (get_option_ul(args, &option)) {
1829 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1831 goto cifs_parse_mount_err;
1833 vol->dir_mode = option;
1836 if (get_option_ul(args, &option) ||
1837 option > USHRT_MAX) {
1838 cifs_dbg(VFS, "%s: Invalid port value\n",
1840 goto cifs_parse_mount_err;
1842 port = (unsigned short)option;
1845 if (get_option_ul(args, &option)) {
1846 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1848 goto cifs_parse_mount_err;
1850 vol->rsize = option;
1853 if (get_option_ul(args, &option)) {
1854 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1856 goto cifs_parse_mount_err;
1858 vol->wsize = option;
1861 if (get_option_ul(args, &option)) {
1862 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1864 goto cifs_parse_mount_err;
1866 vol->actimeo = HZ * option;
1867 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1868 cifs_dbg(VFS, "attribute cache timeout too large\n");
1869 goto cifs_parse_mount_err;
1872 case Opt_echo_interval:
1873 if (get_option_ul(args, &option)) {
1874 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1876 goto cifs_parse_mount_err;
1878 vol->echo_interval = option;
1881 if (get_option_ul(args, &option)) {
1882 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1884 goto cifs_parse_mount_err;
1886 vol->snapshot_time = option;
1888 case Opt_max_credits:
1889 if (get_option_ul(args, &option) || (option < 20) ||
1891 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1893 goto cifs_parse_mount_err;
1895 vol->max_credits = option;
1898 /* String Arguments */
1900 case Opt_blank_user:
1901 /* null user, ie. anonymous authentication */
1903 vol->username = NULL;
1906 string = match_strdup(args);
1910 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1911 CIFS_MAX_USERNAME_LEN) {
1912 pr_warn("CIFS: username too long\n");
1913 goto cifs_parse_mount_err;
1916 kfree(vol->username);
1917 vol->username = kstrdup(string, GFP_KERNEL);
1919 goto cifs_parse_mount_err;
1921 case Opt_blank_pass:
1922 /* passwords have to be handled differently
1923 * to allow the character used for deliminator
1924 * to be passed within them
1928 * Check if this is a case where the password
1929 * starts with a delimiter
1931 tmp_end = strchr(data, '=');
1933 if (!(tmp_end < end && tmp_end[1] == delim)) {
1934 /* No it is not. Set the password to NULL */
1935 kzfree(vol->password);
1936 vol->password = NULL;
1939 /* Yes it is. Drop down to Opt_pass below.*/
1941 /* Obtain the value string */
1942 value = strchr(data, '=');
1945 /* Set tmp_end to end of the string */
1946 tmp_end = (char *) value + strlen(value);
1948 /* Check if following character is the deliminator
1949 * If yes, we have encountered a double deliminator
1950 * reset the NULL character to the deliminator
1952 if (tmp_end < end && tmp_end[1] == delim) {
1955 /* Keep iterating until we get to a single
1956 * deliminator OR the end
1958 while ((tmp_end = strchr(tmp_end, delim))
1959 != NULL && (tmp_end[1] == delim)) {
1960 tmp_end = (char *) &tmp_end[2];
1963 /* Reset var options to point to next element */
1966 options = (char *) &tmp_end[1];
1968 /* Reached the end of the mount option
1973 kzfree(vol->password);
1974 /* Now build new password string */
1975 temp_len = strlen(value);
1976 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1977 if (vol->password == NULL) {
1978 pr_warn("CIFS: no memory for password\n");
1979 goto cifs_parse_mount_err;
1982 for (i = 0, j = 0; i < temp_len; i++, j++) {
1983 vol->password[j] = value[i];
1984 if ((value[i] == delim) &&
1985 value[i+1] == delim)
1986 /* skip the second deliminator */
1989 vol->password[j] = '\0';
1992 /* FIXME: should this be an error instead? */
1996 string = match_strdup(args);
2000 if (!cifs_convert_address(dstaddr, string,
2002 pr_err("CIFS: bad ip= option (%s).\n", string);
2003 goto cifs_parse_mount_err;
2008 string = match_strdup(args);
2012 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
2013 == CIFS_MAX_DOMAINNAME_LEN) {
2014 pr_warn("CIFS: domain name too long\n");
2015 goto cifs_parse_mount_err;
2018 kfree(vol->domainname);
2019 vol->domainname = kstrdup(string, GFP_KERNEL);
2020 if (!vol->domainname) {
2021 pr_warn("CIFS: no memory for domainname\n");
2022 goto cifs_parse_mount_err;
2024 cifs_dbg(FYI, "Domain name set\n");
2027 string = match_strdup(args);
2031 if (!cifs_convert_address(
2032 (struct sockaddr *)&vol->srcaddr,
2033 string, strlen(string))) {
2034 pr_warn("CIFS: Could not parse srcaddr: %s\n",
2036 goto cifs_parse_mount_err;
2040 string = match_strdup(args);
2044 if (strnlen(string, 1024) >= 65) {
2045 pr_warn("CIFS: iocharset name too long.\n");
2046 goto cifs_parse_mount_err;
2049 if (strncasecmp(string, "default", 7) != 0) {
2050 kfree(vol->iocharset);
2051 vol->iocharset = kstrdup(string,
2053 if (!vol->iocharset) {
2054 pr_warn("CIFS: no memory for charset\n");
2055 goto cifs_parse_mount_err;
2058 /* if iocharset not set then load_nls_default
2061 cifs_dbg(FYI, "iocharset set to %s\n", string);
2063 case Opt_netbiosname:
2064 string = match_strdup(args);
2068 memset(vol->source_rfc1001_name, 0x20,
2071 * FIXME: are there cases in which a comma can
2072 * be valid in workstation netbios name (and
2073 * need special handling)?
2075 for (i = 0; i < RFC1001_NAME_LEN; i++) {
2076 /* don't ucase netbiosname for user */
2079 vol->source_rfc1001_name[i] = string[i];
2081 /* The string has 16th byte zero still from
2082 * set at top of the function
2084 if (i == RFC1001_NAME_LEN && string[i] != 0)
2085 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
2088 /* servernetbiosname specified override *SMBSERVER */
2089 string = match_strdup(args);
2093 /* last byte, type, is 0x20 for servr type */
2094 memset(vol->target_rfc1001_name, 0x20,
2095 RFC1001_NAME_LEN_WITH_NULL);
2097 /* BB are there cases in which a comma can be
2098 valid in this workstation netbios name
2099 (and need special handling)? */
2101 /* user or mount helper must uppercase the
2103 for (i = 0; i < 15; i++) {
2106 vol->target_rfc1001_name[i] = string[i];
2108 /* The string has 16th byte zero still from
2109 set at top of the function */
2110 if (i == RFC1001_NAME_LEN && string[i] != 0)
2111 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
2114 /* version of mount userspace tools, not dialect */
2115 string = match_strdup(args);
2119 /* If interface changes in mount.cifs bump to new ver */
2120 if (strncasecmp(string, "1", 1) == 0) {
2121 if (strlen(string) > 1) {
2122 pr_warn("Bad mount helper ver=%s. Did "
2123 "you want SMB1 (CIFS) dialect "
2124 "and mean to type vers=1.0 "
2125 "instead?\n", string);
2126 goto cifs_parse_mount_err;
2128 /* This is the default */
2131 /* For all other value, error */
2132 pr_warn("CIFS: Invalid mount helper version specified\n");
2133 goto cifs_parse_mount_err;
2135 /* protocol version (dialect) */
2136 string = match_strdup(args);
2140 if (cifs_parse_smb_version(string, vol, is_smb3) != 0)
2141 goto cifs_parse_mount_err;
2145 string = match_strdup(args);
2149 if (cifs_parse_security_flavors(string, vol) != 0)
2150 goto cifs_parse_mount_err;
2153 string = match_strdup(args);
2157 if (cifs_parse_cache_flavor(string, vol) != 0)
2158 goto cifs_parse_mount_err;
2162 * An option we don't recognize. Save it off for later
2163 * if we haven't already found one
2169 /* Free up any allocated string */
2174 if (!sloppy && invalid) {
2175 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
2176 goto cifs_parse_mount_err;
2179 if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
2180 cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
2181 goto cifs_parse_mount_err;
2185 /* Muliuser mounts require CONFIG_KEYS support */
2186 if (vol->multiuser) {
2187 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
2188 goto cifs_parse_mount_err;
2192 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
2193 goto cifs_parse_mount_err;
2196 /* make sure UNC has a share name */
2197 if (!strchr(vol->UNC + 3, '\\')) {
2198 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
2199 goto cifs_parse_mount_err;
2206 /* No ip= option specified? Try to get it from UNC */
2207 /* Use the address part of the UNC. */
2208 slash = strchr(&vol->UNC[2], '\\');
2209 len = slash - &vol->UNC[2];
2210 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
2211 pr_err("Unable to determine destination address.\n");
2212 goto cifs_parse_mount_err;
2216 /* set the port that we got earlier */
2217 cifs_set_port(dstaddr, port);
2220 vol->override_uid = override_uid;
2221 else if (override_uid == 1)
2222 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
2225 vol->override_gid = override_gid;
2226 else if (override_gid == 1)
2227 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
2229 if (got_version == false)
2230 pr_warn("No dialect specified on mount. Default has changed to "
2231 "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
2232 "(SMB1). To use the less secure SMB1 dialect to access "
2233 "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
2236 kfree(mountdata_copy);
2240 pr_warn("Could not allocate temporary buffer\n");
2241 cifs_parse_mount_err:
2243 kfree(mountdata_copy);
2247 /** Returns true if srcaddr isn't specified and rhs isn't
2248 * specified, or if srcaddr is specified and
2249 * matches the IP address of the rhs argument.
2252 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2254 switch (srcaddr->sa_family) {
2256 return (rhs->sa_family == AF_UNSPEC);
2258 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2259 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2260 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2263 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2264 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2265 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2269 return false; /* don't expect to be here */
2274 * If no port is specified in addr structure, we try to match with 445 port
2275 * and if it fails - with 139 ports. It should be called only if address
2276 * families of server and addr are equal.
2279 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2281 __be16 port, *sport;
2283 switch (addr->sa_family) {
2285 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2286 port = ((struct sockaddr_in *) addr)->sin_port;
2289 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2290 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2298 port = htons(CIFS_PORT);
2302 port = htons(RFC1001_PORT);
2305 return port == *sport;
2309 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2310 struct sockaddr *srcaddr)
2312 switch (addr->sa_family) {
2314 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2315 struct sockaddr_in *srv_addr4 =
2316 (struct sockaddr_in *)&server->dstaddr;
2318 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2323 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2324 struct sockaddr_in6 *srv_addr6 =
2325 (struct sockaddr_in6 *)&server->dstaddr;
2327 if (!ipv6_addr_equal(&addr6->sin6_addr,
2328 &srv_addr6->sin6_addr))
2330 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2336 return false; /* don't expect to be here */
2339 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2346 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2349 * The select_sectype function should either return the vol->sectype
2350 * that was specified, or "Unspecified" if that sectype was not
2351 * compatible with the given NEGOTIATE request.
2353 if (server->ops->select_sectype(server, vol->sectype)
2358 * Now check if signing mode is acceptable. No need to check
2359 * global_secflags at this point since if MUST_SIGN is set then
2360 * the server->sign had better be too.
2362 if (vol->sign && !server->sign)
2368 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2370 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2372 if (vol->nosharesock)
2375 /* BB update this for smb3any and default case */
2376 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2379 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2382 if (!match_address(server, addr,
2383 (struct sockaddr *)&vol->srcaddr))
2386 if (!match_port(server, addr))
2389 if (!match_security(server, vol))
2392 if (server->echo_interval != vol->echo_interval * HZ)
2395 if (server->rdma != vol->rdma)
2401 static struct TCP_Server_Info *
2402 cifs_find_tcp_session(struct smb_vol *vol)
2404 struct TCP_Server_Info *server;
2406 spin_lock(&cifs_tcp_ses_lock);
2407 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2408 if (!match_server(server, vol))
2411 ++server->srv_count;
2412 spin_unlock(&cifs_tcp_ses_lock);
2413 cifs_dbg(FYI, "Existing tcp session with server found\n");
2416 spin_unlock(&cifs_tcp_ses_lock);
2421 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2423 struct task_struct *task;
2425 spin_lock(&cifs_tcp_ses_lock);
2426 if (--server->srv_count > 0) {
2427 spin_unlock(&cifs_tcp_ses_lock);
2431 put_net(cifs_net_ns(server));
2433 list_del_init(&server->tcp_ses_list);
2434 spin_unlock(&cifs_tcp_ses_lock);
2436 cancel_delayed_work_sync(&server->echo);
2440 * Avoid deadlock here: reconnect work calls
2441 * cifs_put_tcp_session() at its end. Need to be sure
2442 * that reconnect work does nothing with server pointer after
2445 cancel_delayed_work(&server->reconnect);
2447 cancel_delayed_work_sync(&server->reconnect);
2449 spin_lock(&GlobalMid_Lock);
2450 server->tcpStatus = CifsExiting;
2451 spin_unlock(&GlobalMid_Lock);
2453 cifs_crypto_secmech_release(server);
2454 cifs_fscache_release_client_cookie(server);
2456 kfree(server->session_key.response);
2457 server->session_key.response = NULL;
2458 server->session_key.len = 0;
2460 task = xchg(&server->tsk, NULL);
2462 send_sig(SIGKILL, task, 1);
2465 static struct TCP_Server_Info *
2466 cifs_get_tcp_session(struct smb_vol *volume_info)
2468 struct TCP_Server_Info *tcp_ses = NULL;
2471 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2473 /* see if we already have a matching tcp_ses */
2474 tcp_ses = cifs_find_tcp_session(volume_info);
2478 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2484 tcp_ses->ops = volume_info->ops;
2485 tcp_ses->vals = volume_info->vals;
2486 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2487 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2488 if (IS_ERR(tcp_ses->hostname)) {
2489 rc = PTR_ERR(tcp_ses->hostname);
2490 goto out_err_crypto_release;
2493 tcp_ses->noblocksnd = volume_info->noblocksnd;
2494 tcp_ses->noautotune = volume_info->noautotune;
2495 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2496 tcp_ses->rdma = volume_info->rdma;
2497 tcp_ses->in_flight = 0;
2498 tcp_ses->credits = 1;
2499 init_waitqueue_head(&tcp_ses->response_q);
2500 init_waitqueue_head(&tcp_ses->request_q);
2501 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2502 mutex_init(&tcp_ses->srv_mutex);
2503 memcpy(tcp_ses->workstation_RFC1001_name,
2504 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2505 memcpy(tcp_ses->server_RFC1001_name,
2506 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2507 tcp_ses->session_estab = false;
2508 tcp_ses->sequence_number = 0;
2509 tcp_ses->lstrp = jiffies;
2510 spin_lock_init(&tcp_ses->req_lock);
2511 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2512 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2513 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2514 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2515 mutex_init(&tcp_ses->reconnect_mutex);
2516 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2517 sizeof(tcp_ses->srcaddr));
2518 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2519 sizeof(tcp_ses->dstaddr));
2520 generate_random_uuid(tcp_ses->client_guid);
2522 * at this point we are the only ones with the pointer
2523 * to the struct since the kernel thread not created yet
2524 * no need to spinlock this init of tcpStatus or srv_count
2526 tcp_ses->tcpStatus = CifsNew;
2527 ++tcp_ses->srv_count;
2529 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2530 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2531 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2533 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2534 if (tcp_ses->rdma) {
2535 #ifndef CONFIG_CIFS_SMB_DIRECT
2536 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
2538 goto out_err_crypto_release;
2540 tcp_ses->smbd_conn = smbd_get_connection(
2541 tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
2542 if (tcp_ses->smbd_conn) {
2543 cifs_dbg(VFS, "RDMA transport established\n");
2545 goto smbd_connected;
2548 goto out_err_crypto_release;
2551 rc = ip_connect(tcp_ses);
2553 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2554 goto out_err_crypto_release;
2558 * since we're in a cifs function already, we know that
2559 * this will succeed. No need for try_module_get().
2561 __module_get(THIS_MODULE);
2562 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2564 if (IS_ERR(tcp_ses->tsk)) {
2565 rc = PTR_ERR(tcp_ses->tsk);
2566 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2567 module_put(THIS_MODULE);
2568 goto out_err_crypto_release;
2570 tcp_ses->tcpStatus = CifsNeedNegotiate;
2572 /* thread spawned, put it on the list */
2573 spin_lock(&cifs_tcp_ses_lock);
2574 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2575 spin_unlock(&cifs_tcp_ses_lock);
2577 cifs_fscache_get_client_cookie(tcp_ses);
2579 /* queue echo request delayed work */
2580 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2584 out_err_crypto_release:
2585 cifs_crypto_secmech_release(tcp_ses);
2587 put_net(cifs_net_ns(tcp_ses));
2591 if (!IS_ERR(tcp_ses->hostname))
2592 kfree(tcp_ses->hostname);
2593 if (tcp_ses->ssocket)
2594 sock_release(tcp_ses->ssocket);
2600 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2602 if (vol->sectype != Unspecified &&
2603 vol->sectype != ses->sectype)
2606 switch (ses->sectype) {
2608 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2612 /* NULL username means anonymous session */
2613 if (ses->user_name == NULL) {
2619 /* anything else takes username/password */
2620 if (strncmp(ses->user_name,
2621 vol->username ? vol->username : "",
2622 CIFS_MAX_USERNAME_LEN))
2624 if ((vol->username && strlen(vol->username) != 0) &&
2625 ses->password != NULL &&
2626 strncmp(ses->password,
2627 vol->password ? vol->password : "",
2628 CIFS_MAX_PASSWORD_LEN))
2635 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2637 * A new IPC connection is made and stored in the session
2638 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2641 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2644 struct cifs_tcon *tcon;
2645 struct nls_table *nls_codepage;
2646 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2650 * If the mount request that resulted in the creation of the
2651 * session requires encryption, force IPC to be encrypted too.
2653 if (volume_info->seal) {
2654 if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2658 "IPC: server doesn't support encryption\n");
2663 tcon = tconInfoAlloc();
2667 snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->server->hostname);
2670 nls_codepage = load_nls_default();
2676 rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2680 cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2685 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2687 ses->tcon_ipc = tcon;
2689 unload_nls(nls_codepage);
2694 * cifs_free_ipc - helper to release the session IPC tcon
2696 * Needs to be called everytime a session is destroyed
2699 cifs_free_ipc(struct cifs_ses *ses)
2702 struct cifs_tcon *tcon = ses->tcon_ipc;
2707 if (ses->server->ops->tree_disconnect) {
2709 rc = ses->server->ops->tree_disconnect(xid, tcon);
2714 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2717 ses->tcon_ipc = NULL;
2721 static struct cifs_ses *
2722 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2724 struct cifs_ses *ses;
2726 spin_lock(&cifs_tcp_ses_lock);
2727 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2728 if (ses->status == CifsExiting)
2730 if (!match_session(ses, vol))
2733 spin_unlock(&cifs_tcp_ses_lock);
2736 spin_unlock(&cifs_tcp_ses_lock);
2741 cifs_put_smb_ses(struct cifs_ses *ses)
2743 unsigned int rc, xid;
2744 struct TCP_Server_Info *server = ses->server;
2746 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2748 spin_lock(&cifs_tcp_ses_lock);
2749 if (ses->status == CifsExiting) {
2750 spin_unlock(&cifs_tcp_ses_lock);
2753 if (--ses->ses_count > 0) {
2754 spin_unlock(&cifs_tcp_ses_lock);
2757 if (ses->status == CifsGood)
2758 ses->status = CifsExiting;
2759 spin_unlock(&cifs_tcp_ses_lock);
2763 if (ses->status == CifsExiting && server->ops->logoff) {
2765 rc = server->ops->logoff(xid, ses);
2767 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2772 spin_lock(&cifs_tcp_ses_lock);
2773 list_del_init(&ses->smb_ses_list);
2774 spin_unlock(&cifs_tcp_ses_lock);
2777 cifs_put_tcp_session(server, 0);
2782 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2783 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2785 /* Populate username and pw fields from keyring if possible */
2787 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2791 const char *delim, *payload;
2795 struct TCP_Server_Info *server = ses->server;
2796 struct sockaddr_in *sa;
2797 struct sockaddr_in6 *sa6;
2798 const struct user_key_payload *upayload;
2800 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2804 /* try to find an address key first */
2805 switch (server->dstaddr.ss_family) {
2807 sa = (struct sockaddr_in *)&server->dstaddr;
2808 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2811 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2812 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2815 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2816 server->dstaddr.ss_family);
2821 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2822 key = request_key(&key_type_logon, desc, "");
2824 if (!ses->domainName) {
2825 cifs_dbg(FYI, "domainName is NULL\n");
2830 /* didn't work, try to find a domain key */
2831 sprintf(desc, "cifs:d:%s", ses->domainName);
2832 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2833 key = request_key(&key_type_logon, desc, "");
2841 down_read(&key->sem);
2842 upayload = user_key_payload_locked(key);
2843 if (IS_ERR_OR_NULL(upayload)) {
2844 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2848 /* find first : in payload */
2849 payload = upayload->data;
2850 delim = strnchr(payload, upayload->datalen, ':');
2851 cifs_dbg(FYI, "payload=%s\n", payload);
2853 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2859 len = delim - payload;
2860 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2861 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2867 vol->username = kstrndup(payload, len, GFP_KERNEL);
2868 if (!vol->username) {
2869 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2874 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2876 len = key->datalen - (len + 1);
2877 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2878 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2880 kfree(vol->username);
2881 vol->username = NULL;
2886 vol->password = kstrndup(delim, len, GFP_KERNEL);
2887 if (!vol->password) {
2888 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2891 kfree(vol->username);
2892 vol->username = NULL;
2897 * If we have a domain key then we must set the domainName in the
2900 if (is_domain && ses->domainName) {
2901 vol->domainname = kstrndup(ses->domainName,
2902 strlen(ses->domainName),
2904 if (!vol->domainname) {
2905 cifs_dbg(FYI, "Unable to allocate %zd bytes for "
2908 kfree(vol->username);
2909 vol->username = NULL;
2910 kzfree(vol->password);
2911 vol->password = NULL;
2921 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2924 #else /* ! CONFIG_KEYS */
2926 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2927 struct cifs_ses *ses __attribute__((unused)))
2931 #endif /* CONFIG_KEYS */
2934 * cifs_get_smb_ses - get a session matching @volume_info data from @server
2936 * This function assumes it is being called from cifs_mount() where we
2937 * already got a server reference (server refcount +1). See
2938 * cifs_get_tcon() for refcount explanations.
2940 static struct cifs_ses *
2941 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2945 struct cifs_ses *ses;
2946 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2947 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2951 ses = cifs_find_smb_ses(server, volume_info);
2953 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2956 mutex_lock(&ses->session_mutex);
2957 rc = cifs_negotiate_protocol(xid, ses);
2959 mutex_unlock(&ses->session_mutex);
2960 /* problem -- put our ses reference */
2961 cifs_put_smb_ses(ses);
2965 if (ses->need_reconnect) {
2966 cifs_dbg(FYI, "Session needs reconnect\n");
2967 rc = cifs_setup_session(xid, ses,
2968 volume_info->local_nls);
2970 mutex_unlock(&ses->session_mutex);
2971 /* problem -- put our reference */
2972 cifs_put_smb_ses(ses);
2977 mutex_unlock(&ses->session_mutex);
2979 /* existing SMB ses has a server reference already */
2980 cifs_put_tcp_session(server, 0);
2985 cifs_dbg(FYI, "Existing smb sess not found\n");
2986 ses = sesInfoAlloc();
2990 /* new SMB session uses our server ref */
2991 ses->server = server;
2992 if (server->dstaddr.ss_family == AF_INET6)
2993 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2995 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2997 if (volume_info->username) {
2998 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2999 if (!ses->user_name)
3003 /* volume_info->password freed at unmount */
3004 if (volume_info->password) {
3005 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
3009 if (volume_info->domainname) {
3010 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
3011 if (!ses->domainName)
3014 if (volume_info->domainauto)
3015 ses->domainAuto = volume_info->domainauto;
3016 ses->cred_uid = volume_info->cred_uid;
3017 ses->linux_uid = volume_info->linux_uid;
3019 ses->sectype = volume_info->sectype;
3020 ses->sign = volume_info->sign;
3022 mutex_lock(&ses->session_mutex);
3023 rc = cifs_negotiate_protocol(xid, ses);
3025 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
3026 mutex_unlock(&ses->session_mutex);
3030 /* success, put it on the list */
3031 spin_lock(&cifs_tcp_ses_lock);
3032 list_add(&ses->smb_ses_list, &server->smb_ses_list);
3033 spin_unlock(&cifs_tcp_ses_lock);
3037 cifs_setup_ipc(ses, volume_info);
3047 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
3049 if (tcon->tidStatus == CifsExiting)
3051 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
3053 if (tcon->seal != volume_info->seal)
3055 if (tcon->snapshot_time != volume_info->snapshot_time)
3057 if (tcon->no_lease != volume_info->no_lease)
3062 static struct cifs_tcon *
3063 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3065 struct list_head *tmp;
3066 struct cifs_tcon *tcon;
3068 spin_lock(&cifs_tcp_ses_lock);
3069 list_for_each(tmp, &ses->tcon_list) {
3070 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
3071 if (!match_tcon(tcon, volume_info))
3074 spin_unlock(&cifs_tcp_ses_lock);
3077 spin_unlock(&cifs_tcp_ses_lock);
3082 cifs_put_tcon(struct cifs_tcon *tcon)
3085 struct cifs_ses *ses;
3088 * IPC tcon share the lifetime of their session and are
3089 * destroyed in the session put function
3091 if (tcon == NULL || tcon->ipc)
3095 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3096 spin_lock(&cifs_tcp_ses_lock);
3097 if (--tcon->tc_count > 0) {
3098 spin_unlock(&cifs_tcp_ses_lock);
3102 list_del_init(&tcon->tcon_list);
3103 spin_unlock(&cifs_tcp_ses_lock);
3106 if (ses->server->ops->tree_disconnect)
3107 ses->server->ops->tree_disconnect(xid, tcon);
3110 cifs_fscache_release_super_cookie(tcon);
3112 cifs_put_smb_ses(ses);
3116 * cifs_get_tcon - get a tcon matching @volume_info data from @ses
3118 * - tcon refcount is the number of mount points using the tcon.
3119 * - ses refcount is the number of tcon using the session.
3121 * 1. This function assumes it is being called from cifs_mount() where
3122 * we already got a session reference (ses refcount +1).
3124 * 2. Since we're in the context of adding a mount point, the end
3125 * result should be either:
3127 * a) a new tcon already allocated with refcount=1 (1 mount point) and
3128 * its session refcount incremented (1 new tcon). This +1 was
3129 * already done in (1).
3131 * b) an existing tcon with refcount+1 (add a mount point to it) and
3132 * identical ses refcount (no new tcon). Because of (1) we need to
3133 * decrement the ses refcount.
3135 static struct cifs_tcon *
3136 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3139 struct cifs_tcon *tcon;
3141 tcon = cifs_find_tcon(ses, volume_info);
3144 * tcon has refcount already incremented but we need to
3145 * decrement extra ses reference gotten by caller (case b)
3147 cifs_dbg(FYI, "Found match on UNC path\n");
3148 cifs_put_smb_ses(ses);
3152 if (!ses->server->ops->tree_connect) {
3157 tcon = tconInfoAlloc();
3163 if (volume_info->snapshot_time) {
3164 if (ses->server->vals->protocol_id == 0) {
3166 "Use SMB2 or later for snapshot mount option\n");
3170 tcon->snapshot_time = volume_info->snapshot_time;
3174 if (volume_info->password) {
3175 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
3176 if (!tcon->password) {
3182 if (volume_info->seal) {
3183 if (ses->server->vals->protocol_id == 0) {
3185 "SMB3 or later required for encryption\n");
3188 } else if (tcon->ses->server->capabilities &
3189 SMB2_GLOBAL_CAP_ENCRYPTION)
3192 cifs_dbg(VFS, "Encryption is not supported on share\n");
3198 if (volume_info->linux_ext) {
3199 if (ses->server->posix_ext_supported) {
3200 tcon->posix_extensions = true;
3201 printk_once(KERN_WARNING
3202 "SMB3.11 POSIX Extensions are experimental\n");
3204 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");
3211 * BB Do we need to wrap session_mutex around this TCon call and Unix
3212 * SetFS as we do on SessSetup and reconnect?
3215 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
3216 volume_info->local_nls);
3218 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
3222 if (volume_info->nodfs) {
3223 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
3224 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
3226 tcon->use_persistent = false;
3227 /* check if SMB2 or later, CIFS does not support persistent handles */
3228 if (volume_info->persistent) {
3229 if (ses->server->vals->protocol_id == 0) {
3231 "SMB3 or later required for persistent handles\n");
3234 } else if (ses->server->capabilities &
3235 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3236 tcon->use_persistent = true;
3237 else /* persistent handles requested but not supported */ {
3239 "Persistent handles not supported on share\n");
3243 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
3244 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3245 && (volume_info->nopersistent == false)) {
3246 cifs_dbg(FYI, "enabling persistent handles\n");
3247 tcon->use_persistent = true;
3248 } else if (volume_info->resilient) {
3249 if (ses->server->vals->protocol_id == 0) {
3251 "SMB2.1 or later required for resilient handles\n");
3255 tcon->use_resilient = true;
3259 * We can have only one retry value for a connection to a share so for
3260 * resources mounted more than once to the same server share the last
3261 * value passed in for the retry flag is used.
3263 tcon->retry = volume_info->retry;
3264 tcon->nocase = volume_info->nocase;
3265 tcon->nohandlecache = volume_info->nohandlecache;
3266 tcon->local_lease = volume_info->local_lease;
3267 tcon->no_lease = volume_info->no_lease;
3268 INIT_LIST_HEAD(&tcon->pending_opens);
3270 spin_lock(&cifs_tcp_ses_lock);
3271 list_add(&tcon->tcon_list, &ses->tcon_list);
3272 spin_unlock(&cifs_tcp_ses_lock);
3274 cifs_fscache_get_super_cookie(tcon);
3284 cifs_put_tlink(struct tcon_link *tlink)
3286 if (!tlink || IS_ERR(tlink))
3289 if (!atomic_dec_and_test(&tlink->tl_count) ||
3290 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
3291 tlink->tl_time = jiffies;
3295 if (!IS_ERR(tlink_tcon(tlink)))
3296 cifs_put_tcon(tlink_tcon(tlink));
3302 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3304 struct cifs_sb_info *old = CIFS_SB(sb);
3305 struct cifs_sb_info *new = mnt_data->cifs_sb;
3306 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
3307 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
3309 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
3312 if (old->mnt_cifs_serverino_autodisabled)
3313 newflags &= ~CIFS_MOUNT_SERVER_INUM;
3315 if (oldflags != newflags)
3319 * We want to share sb only if we don't specify an r/wsize or
3320 * specified r/wsize is greater than or equal to existing one.
3322 if (new->wsize && new->wsize < old->wsize)
3325 if (new->rsize && new->rsize < old->rsize)
3328 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3331 if (old->mnt_file_mode != new->mnt_file_mode ||
3332 old->mnt_dir_mode != new->mnt_dir_mode)
3335 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3338 if (old->actimeo != new->actimeo)
3345 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3347 struct cifs_sb_info *old = CIFS_SB(sb);
3348 struct cifs_sb_info *new = mnt_data->cifs_sb;
3349 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3351 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3354 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3356 else if (!old_set && !new_set)
3363 cifs_match_super(struct super_block *sb, void *data)
3365 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3366 struct smb_vol *volume_info;
3367 struct cifs_sb_info *cifs_sb;
3368 struct TCP_Server_Info *tcp_srv;
3369 struct cifs_ses *ses;
3370 struct cifs_tcon *tcon;
3371 struct tcon_link *tlink;
3374 spin_lock(&cifs_tcp_ses_lock);
3375 cifs_sb = CIFS_SB(sb);
3376 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3377 if (tlink == NULL) {
3378 /* can not match superblock if tlink were ever null */
3379 spin_unlock(&cifs_tcp_ses_lock);
3382 tcon = tlink_tcon(tlink);
3384 tcp_srv = ses->server;
3386 volume_info = mnt_data->vol;
3388 if (!match_server(tcp_srv, volume_info) ||
3389 !match_session(ses, volume_info) ||
3390 !match_tcon(tcon, volume_info) ||
3391 !match_prepath(sb, mnt_data)) {
3396 rc = compare_mount_options(sb, mnt_data);
3398 spin_unlock(&cifs_tcp_ses_lock);
3399 cifs_put_tlink(tlink);
3404 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
3405 const struct nls_table *nls_codepage, unsigned int *num_referrals,
3406 struct dfs_info3_param **referrals, int remap)
3410 if (!ses->server->ops->get_dfs_refer)
3416 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3417 referrals, num_referrals,
3418 nls_codepage, remap);
3422 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3423 static struct lock_class_key cifs_key[2];
3424 static struct lock_class_key cifs_slock_key[2];
3427 cifs_reclassify_socket4(struct socket *sock)
3429 struct sock *sk = sock->sk;
3430 BUG_ON(!sock_allow_reclassification(sk));
3431 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3432 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3436 cifs_reclassify_socket6(struct socket *sock)
3438 struct sock *sk = sock->sk;
3439 BUG_ON(!sock_allow_reclassification(sk));
3440 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3441 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3445 cifs_reclassify_socket4(struct socket *sock)
3450 cifs_reclassify_socket6(struct socket *sock)
3455 /* See RFC1001 section 14 on representation of Netbios names */
3456 static void rfc1002mangle(char *target, char *source, unsigned int length)
3460 for (i = 0, j = 0; i < (length); i++) {
3461 /* mask a nibble at a time and encode */
3462 target[j] = 'A' + (0x0F & (source[i] >> 4));
3463 target[j+1] = 'A' + (0x0F & source[i]);
3470 bind_socket(struct TCP_Server_Info *server)
3473 if (server->srcaddr.ss_family != AF_UNSPEC) {
3474 /* Bind to the specified local IP address */
3475 struct socket *socket = server->ssocket;
3476 rc = socket->ops->bind(socket,
3477 (struct sockaddr *) &server->srcaddr,
3478 sizeof(server->srcaddr));
3480 struct sockaddr_in *saddr4;
3481 struct sockaddr_in6 *saddr6;
3482 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3483 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3484 if (saddr6->sin6_family == AF_INET6)
3485 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3486 &saddr6->sin6_addr, rc);
3488 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3489 &saddr4->sin_addr.s_addr, rc);
3496 ip_rfc1001_connect(struct TCP_Server_Info *server)
3500 * some servers require RFC1001 sessinit before sending
3501 * negprot - BB check reconnection in case where second
3502 * sessinit is sent but no second negprot
3504 struct rfc1002_session_packet *ses_init_buf;
3505 struct smb_hdr *smb_buf;
3506 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3509 ses_init_buf->trailer.session_req.called_len = 32;
3511 if (server->server_RFC1001_name[0] != 0)
3512 rfc1002mangle(ses_init_buf->trailer.
3513 session_req.called_name,
3514 server->server_RFC1001_name,
3515 RFC1001_NAME_LEN_WITH_NULL);
3517 rfc1002mangle(ses_init_buf->trailer.
3518 session_req.called_name,
3519 DEFAULT_CIFS_CALLED_NAME,
3520 RFC1001_NAME_LEN_WITH_NULL);
3522 ses_init_buf->trailer.session_req.calling_len = 32;
3525 * calling name ends in null (byte 16) from old smb
3528 if (server->workstation_RFC1001_name[0] != 0)
3529 rfc1002mangle(ses_init_buf->trailer.
3530 session_req.calling_name,
3531 server->workstation_RFC1001_name,
3532 RFC1001_NAME_LEN_WITH_NULL);
3534 rfc1002mangle(ses_init_buf->trailer.
3535 session_req.calling_name,
3537 RFC1001_NAME_LEN_WITH_NULL);
3539 ses_init_buf->trailer.session_req.scope1 = 0;
3540 ses_init_buf->trailer.session_req.scope2 = 0;
3541 smb_buf = (struct smb_hdr *)ses_init_buf;
3543 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3544 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3545 rc = smb_send(server, smb_buf, 0x44);
3546 kfree(ses_init_buf);
3548 * RFC1001 layer in at least one server
3549 * requires very short break before negprot
3550 * presumably because not expecting negprot
3551 * to follow so fast. This is a simple
3552 * solution that works without
3553 * complicating the code and causes no
3554 * significant slowing down on mount
3557 usleep_range(1000, 2000);
3560 * else the negprot may still work without this
3561 * even though malloc failed
3568 generic_ip_connect(struct TCP_Server_Info *server)
3573 struct socket *socket = server->ssocket;
3574 struct sockaddr *saddr;
3576 saddr = (struct sockaddr *) &server->dstaddr;
3578 if (server->dstaddr.ss_family == AF_INET6) {
3579 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3580 slen = sizeof(struct sockaddr_in6);
3583 sport = ((struct sockaddr_in *) saddr)->sin_port;
3584 slen = sizeof(struct sockaddr_in);
3588 if (socket == NULL) {
3589 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3590 IPPROTO_TCP, &socket, 1);
3592 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3593 server->ssocket = NULL;
3597 /* BB other socket options to set KEEPALIVE, NODELAY? */
3598 cifs_dbg(FYI, "Socket created\n");
3599 server->ssocket = socket;
3600 socket->sk->sk_allocation = GFP_NOFS;
3601 if (sfamily == AF_INET6)
3602 cifs_reclassify_socket6(socket);
3604 cifs_reclassify_socket4(socket);
3607 rc = bind_socket(server);
3612 * Eventually check for other socket options to change from
3613 * the default. sock_setsockopt not used because it expects
3616 socket->sk->sk_rcvtimeo = 7 * HZ;
3617 socket->sk->sk_sndtimeo = 5 * HZ;
3619 /* make the bufsizes depend on wsize/rsize and max requests */
3620 if (server->noautotune) {
3621 if (socket->sk->sk_sndbuf < (200 * 1024))
3622 socket->sk->sk_sndbuf = 200 * 1024;
3623 if (socket->sk->sk_rcvbuf < (140 * 1024))
3624 socket->sk->sk_rcvbuf = 140 * 1024;
3627 if (server->tcp_nodelay) {
3629 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3630 (char *)&val, sizeof(val));
3632 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3636 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3637 socket->sk->sk_sndbuf,
3638 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3640 rc = socket->ops->connect(socket, saddr, slen, 0);
3642 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3643 sock_release(socket);
3644 server->ssocket = NULL;
3648 if (sport == htons(RFC1001_PORT))
3649 rc = ip_rfc1001_connect(server);
3655 ip_connect(struct TCP_Server_Info *server)
3658 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3659 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3661 if (server->dstaddr.ss_family == AF_INET6)
3662 sport = &addr6->sin6_port;
3664 sport = &addr->sin_port;
3669 /* try with 445 port at first */
3670 *sport = htons(CIFS_PORT);
3672 rc = generic_ip_connect(server);
3676 /* if it failed, try with 139 port */
3677 *sport = htons(RFC1001_PORT);
3680 return generic_ip_connect(server);
3683 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3684 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3686 /* if we are reconnecting then should we check to see if
3687 * any requested capabilities changed locally e.g. via
3688 * remount but we can not do much about it here
3689 * if they have (even if we could detect it by the following)
3690 * Perhaps we could add a backpointer to array of sb from tcon
3691 * or if we change to make all sb to same share the same
3692 * sb as NFS - then we only have one backpointer to sb.
3693 * What if we wanted to mount the server share twice once with
3694 * and once without posixacls or posix paths? */
3695 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3697 if (vol_info && vol_info->no_linux_ext) {
3698 tcon->fsUnixInfo.Capability = 0;
3699 tcon->unix_ext = 0; /* Unix Extensions disabled */
3700 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3702 } else if (vol_info)
3703 tcon->unix_ext = 1; /* Unix Extensions supported */
3705 if (tcon->unix_ext == 0) {
3706 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3710 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3711 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3712 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3713 /* check for reconnect case in which we do not
3714 want to change the mount behavior if we can avoid it */
3715 if (vol_info == NULL) {
3716 /* turn off POSIX ACL and PATHNAMES if not set
3717 originally at mount time */
3718 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3719 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3720 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3721 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3722 cifs_dbg(VFS, "POSIXPATH support change\n");
3723 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3724 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3725 cifs_dbg(VFS, "possible reconnect error\n");
3726 cifs_dbg(VFS, "server disabled POSIX path support\n");
3730 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3731 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3733 cap &= CIFS_UNIX_CAP_MASK;
3734 if (vol_info && vol_info->no_psx_acl)
3735 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3736 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3737 cifs_dbg(FYI, "negotiated posix acl support\n");
3739 cifs_sb->mnt_cifs_flags |=
3740 CIFS_MOUNT_POSIXACL;
3743 if (vol_info && vol_info->posix_paths == 0)
3744 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3745 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3746 cifs_dbg(FYI, "negotiate posix pathnames\n");
3748 cifs_sb->mnt_cifs_flags |=
3749 CIFS_MOUNT_POSIX_PATHS;
3752 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3753 #ifdef CONFIG_CIFS_DEBUG2
3754 if (cap & CIFS_UNIX_FCNTL_CAP)
3755 cifs_dbg(FYI, "FCNTL cap\n");
3756 if (cap & CIFS_UNIX_EXTATTR_CAP)
3757 cifs_dbg(FYI, "EXTATTR cap\n");
3758 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3759 cifs_dbg(FYI, "POSIX path cap\n");
3760 if (cap & CIFS_UNIX_XATTR_CAP)
3761 cifs_dbg(FYI, "XATTR cap\n");
3762 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3763 cifs_dbg(FYI, "POSIX ACL cap\n");
3764 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3765 cifs_dbg(FYI, "very large read cap\n");
3766 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3767 cifs_dbg(FYI, "very large write cap\n");
3768 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3769 cifs_dbg(FYI, "transport encryption cap\n");
3770 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3771 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3772 #endif /* CIFS_DEBUG2 */
3773 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3774 if (vol_info == NULL) {
3775 cifs_dbg(FYI, "resetting capabilities failed\n");
3777 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3783 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3784 struct cifs_sb_info *cifs_sb)
3786 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3788 spin_lock_init(&cifs_sb->tlink_tree_lock);
3789 cifs_sb->tlink_tree = RB_ROOT;
3792 * Temporarily set r/wsize for matching superblock. If we end up using
3793 * new sb then client will later negotiate it downward if needed.
3795 cifs_sb->rsize = pvolume_info->rsize;
3796 cifs_sb->wsize = pvolume_info->wsize;
3798 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3799 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3800 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3801 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3802 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3803 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3805 cifs_sb->actimeo = pvolume_info->actimeo;
3806 cifs_sb->local_nls = pvolume_info->local_nls;
3808 if (pvolume_info->noperm)
3809 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3810 if (pvolume_info->setuids)
3811 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3812 if (pvolume_info->setuidfromacl)
3813 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3814 if (pvolume_info->server_ino)
3815 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3816 if (pvolume_info->remap)
3817 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3818 if (pvolume_info->sfu_remap)
3819 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3820 if (pvolume_info->no_xattr)
3821 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3822 if (pvolume_info->sfu_emul)
3823 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3824 if (pvolume_info->nobrl)
3825 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3826 if (pvolume_info->nohandlecache)
3827 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
3828 if (pvolume_info->nostrictsync)
3829 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3830 if (pvolume_info->mand_lock)
3831 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3832 if (pvolume_info->rwpidforward)
3833 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3834 if (pvolume_info->cifs_acl)
3835 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3836 if (pvolume_info->backupuid_specified) {
3837 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3838 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3840 if (pvolume_info->backupgid_specified) {
3841 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3842 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3844 if (pvolume_info->override_uid)
3845 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3846 if (pvolume_info->override_gid)
3847 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3848 if (pvolume_info->dynperm)
3849 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3850 if (pvolume_info->fsc)
3851 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3852 if (pvolume_info->multiuser)
3853 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3854 CIFS_MOUNT_NO_PERM);
3855 if (pvolume_info->strict_io)
3856 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3857 if (pvolume_info->direct_io) {
3858 cifs_dbg(FYI, "mounting share using direct i/o\n");
3859 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3861 if (pvolume_info->mfsymlinks) {
3862 if (pvolume_info->sfu_emul) {
3864 * Our SFU ("Services for Unix" emulation does not allow
3865 * creating symlinks but does allow reading existing SFU
3866 * symlinks (it does allow both creating and reading SFU
3867 * style mknod and FIFOs though). When "mfsymlinks" and
3868 * "sfu" are both enabled at the same time, it allows
3869 * reading both types of symlinks, but will only create
3870 * them with mfsymlinks format. This allows better
3871 * Apple compatibility (probably better for Samba too)
3872 * while still recognizing old Windows style symlinks.
3874 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3876 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3879 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3880 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3882 if (pvolume_info->prepath) {
3883 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3884 if (cifs_sb->prepath == NULL)
3892 cleanup_volume_info_contents(struct smb_vol *volume_info)
3894 kfree(volume_info->username);
3895 kzfree(volume_info->password);
3896 kfree(volume_info->UNC);
3897 kfree(volume_info->domainname);
3898 kfree(volume_info->iocharset);
3899 kfree(volume_info->prepath);
3903 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3907 cleanup_volume_info_contents(volume_info);
3912 #ifdef CONFIG_CIFS_DFS_UPCALL
3914 * cifs_build_path_to_root returns full path to root when we do not have an
3915 * exiting connection (tcon)
3918 build_unc_path_to_root(const struct smb_vol *vol,
3919 const struct cifs_sb_info *cifs_sb)
3921 char *full_path, *pos;
3922 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3923 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3925 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3926 if (full_path == NULL)
3927 return ERR_PTR(-ENOMEM);
3929 strncpy(full_path, vol->UNC, unc_len);
3930 pos = full_path + unc_len;
3933 *pos = CIFS_DIR_SEP(cifs_sb);
3934 strncpy(pos + 1, vol->prepath, pplen);
3938 *pos = '\0'; /* add trailing null */
3939 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3940 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3945 * Perform a dfs referral query for a share and (optionally) prefix
3947 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3948 * to a string containing updated options for the submount. Otherwise it
3949 * will be left untouched.
3951 * Returns the rc from get_dfs_path to the caller, which can be used to
3952 * determine whether there were referrals.
3955 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3956 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3960 unsigned int num_referrals = 0;
3961 struct dfs_info3_param *referrals = NULL;
3962 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3964 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3965 if (IS_ERR(full_path))
3966 return PTR_ERR(full_path);
3968 /* For DFS paths, skip the first '\' of the UNC */
3969 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3971 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3972 &num_referrals, &referrals, cifs_remap(cifs_sb));
3974 if (!rc && num_referrals > 0) {
3975 char *fake_devname = NULL;
3977 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3978 full_path + 1, referrals,
3981 free_dfs_info_array(referrals, num_referrals);
3983 if (IS_ERR(mdata)) {
3984 rc = PTR_ERR(mdata);
3987 cleanup_volume_info_contents(volume_info);
3988 rc = cifs_setup_volume_info(volume_info, mdata,
3989 fake_devname, false);
3991 kfree(fake_devname);
3992 kfree(cifs_sb->mountdata);
3993 cifs_sb->mountdata = mdata;
4001 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
4002 const char *devname, bool is_smb3)
4006 if (cifs_parse_mount_options(mount_data, devname, volume_info, is_smb3))
4009 if (volume_info->nullauth) {
4010 cifs_dbg(FYI, "Anonymous login\n");
4011 kfree(volume_info->username);
4012 volume_info->username = NULL;
4013 } else if (volume_info->username) {
4014 /* BB fixme parse for domain name here */
4015 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
4017 cifs_dbg(VFS, "No username specified\n");
4018 /* In userspace mount helper we can get user name from alternate
4019 locations such as env variables and files on disk */
4023 /* this is needed for ASCII cp to Unicode converts */
4024 if (volume_info->iocharset == NULL) {
4025 /* load_nls_default cannot return null */
4026 volume_info->local_nls = load_nls_default();
4028 volume_info->local_nls = load_nls(volume_info->iocharset);
4029 if (volume_info->local_nls == NULL) {
4030 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
4031 volume_info->iocharset);
4040 cifs_get_volume_info(char *mount_data, const char *devname, bool is_smb3)
4043 struct smb_vol *volume_info;
4045 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
4047 return ERR_PTR(-ENOMEM);
4049 rc = cifs_setup_volume_info(volume_info, mount_data, devname, is_smb3);
4051 cifs_cleanup_volume_info(volume_info);
4052 volume_info = ERR_PTR(rc);
4059 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
4061 struct cifs_tcon *tcon,
4062 struct cifs_sb_info *cifs_sb,
4069 sep = CIFS_DIR_SEP(cifs_sb);
4072 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
4074 /* skip separators */
4079 /* next separator */
4080 while (*s && *s != sep)
4084 * temporarily null-terminate the path at the end of
4085 * the current component
4089 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4097 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
4101 struct cifs_ses *ses;
4102 struct cifs_tcon *tcon;
4103 struct TCP_Server_Info *server;
4105 struct tcon_link *tlink;
4106 #ifdef CONFIG_CIFS_DFS_UPCALL
4107 int referral_walks_count = 0;
4110 #ifdef CONFIG_CIFS_DFS_UPCALL
4112 /* cleanup activities if we're chasing a referral */
4113 if (referral_walks_count) {
4115 cifs_put_tcon(tcon);
4117 cifs_put_smb_ses(ses);
4119 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
4133 /* get a reference to a tcp session */
4134 server = cifs_get_tcp_session(volume_info);
4135 if (IS_ERR(server)) {
4136 rc = PTR_ERR(server);
4139 if ((volume_info->max_credits < 20) ||
4140 (volume_info->max_credits > 60000))
4141 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
4143 server->max_credits = volume_info->max_credits;
4144 /* get a reference to a SMB session */
4145 ses = cifs_get_smb_ses(server, volume_info);
4149 goto mount_fail_check;
4152 if ((volume_info->persistent == true) && ((ses->server->capabilities &
4153 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
4154 cifs_dbg(VFS, "persistent handles not supported by server\n");
4156 goto mount_fail_check;
4159 /* search for existing tcon to this server share */
4160 tcon = cifs_get_tcon(ses, volume_info);
4165 goto mount_fail_check;
4167 goto remote_path_check;
4170 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
4171 if (tcon->posix_extensions)
4172 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
4174 /* tell server which Unix caps we support */
4175 if (cap_unix(tcon->ses)) {
4176 /* reset of caps checks mount to see if unix extensions
4177 disabled for just this mount */
4178 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
4179 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
4180 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
4181 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
4183 goto mount_fail_check;
4186 tcon->unix_ext = 0; /* server does not support them */
4188 /* do not care if a following call succeed - informational */
4189 if (!tcon->pipe && server->ops->qfs_tcon)
4190 server->ops->qfs_tcon(xid, tcon);
4192 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
4193 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
4196 #ifdef CONFIG_CIFS_DFS_UPCALL
4198 * Perform an unconditional check for whether there are DFS
4199 * referrals for this path without prefix, to provide support
4200 * for DFS referrals from w2k8 servers which don't seem to respond
4201 * with PATH_NOT_COVERED to requests that include the prefix.
4202 * Chase the referral if found, otherwise continue normally.
4204 if (referral_walks_count == 0) {
4205 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
4208 referral_walks_count++;
4209 goto try_mount_again;
4214 /* check if a whole path is not remote */
4216 if (!server->ops->is_path_accessible) {
4218 goto mount_fail_check;
4221 * cifs_build_path_to_root works only when we have a valid tcon
4223 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
4224 tcon->Flags & SMB_SHARE_IS_IN_DFS);
4225 if (full_path == NULL) {
4227 goto mount_fail_check;
4229 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4231 if (rc != 0 && rc != -EREMOTE) {
4233 goto mount_fail_check;
4236 if (rc != -EREMOTE) {
4237 rc = cifs_are_all_path_components_accessible(server,
4241 cifs_dbg(VFS, "cannot query dirs between root and final path, "
4242 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
4243 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4250 /* get referral if needed */
4251 if (rc == -EREMOTE) {
4252 #ifdef CONFIG_CIFS_DFS_UPCALL
4253 if (referral_walks_count > MAX_NESTED_LINKS) {
4255 * BB: when we implement proper loop detection,
4256 * we will remove this check. But now we need it
4257 * to prevent an indefinite loop if 'DFS tree' is
4258 * misconfigured (i.e. has loops).
4261 goto mount_fail_check;
4264 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
4267 referral_walks_count++;
4268 goto try_mount_again;
4270 goto mount_fail_check;
4271 #else /* No DFS support, return error on mount */
4277 goto mount_fail_check;
4279 /* now, hang the tcon off of the superblock */
4280 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
4281 if (tlink == NULL) {
4283 goto mount_fail_check;
4286 tlink->tl_uid = ses->linux_uid;
4287 tlink->tl_tcon = tcon;
4288 tlink->tl_time = jiffies;
4289 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
4290 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4292 cifs_sb->master_tlink = tlink;
4293 spin_lock(&cifs_sb->tlink_tree_lock);
4294 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4295 spin_unlock(&cifs_sb->tlink_tree_lock);
4297 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4301 /* on error free sesinfo and tcon struct if needed */
4303 /* If find_unc succeeded then rc == 0 so we can not end */
4304 /* up accidentally freeing someone elses tcon struct */
4306 cifs_put_tcon(tcon);
4308 cifs_put_smb_ses(ses);
4310 cifs_put_tcp_session(server, 0);
4319 * Issue a TREE_CONNECT request.
4322 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
4323 const char *tree, struct cifs_tcon *tcon,
4324 const struct nls_table *nls_codepage)
4326 struct smb_hdr *smb_buffer;
4327 struct smb_hdr *smb_buffer_response;
4330 unsigned char *bcc_ptr;
4333 __u16 bytes_left, count;
4338 smb_buffer = cifs_buf_get();
4339 if (smb_buffer == NULL)
4342 smb_buffer_response = smb_buffer;
4344 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
4345 NULL /*no tid */ , 4 /*wct */ );
4347 smb_buffer->Mid = get_next_mid(ses->server);
4348 smb_buffer->Uid = ses->Suid;
4349 pSMB = (TCONX_REQ *) smb_buffer;
4350 pSMBr = (TCONX_RSP *) smb_buffer_response;
4352 pSMB->AndXCommand = 0xFF;
4353 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
4354 bcc_ptr = &pSMB->Password[0];
4355 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
4356 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
4357 *bcc_ptr = 0; /* password is null byte */
4358 bcc_ptr++; /* skip password */
4359 /* already aligned so no need to do it below */
4361 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
4362 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
4363 specified as required (when that support is added to
4364 the vfs in the future) as only NTLM or the much
4365 weaker LANMAN (which we do not send by default) is accepted
4366 by Samba (not sure whether other servers allow
4367 NTLMv2 password here) */
4368 #ifdef CONFIG_CIFS_WEAK_PW_HASH
4369 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
4370 (ses->sectype == LANMAN))
4371 calc_lanman_hash(tcon->password, ses->server->cryptkey,
4372 ses->server->sec_mode &
4373 SECMODE_PW_ENCRYPT ? true : false,
4376 #endif /* CIFS_WEAK_PW_HASH */
4377 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
4378 bcc_ptr, nls_codepage);
4380 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
4382 cifs_buf_release(smb_buffer);
4386 bcc_ptr += CIFS_AUTH_RESP_SIZE;
4387 if (ses->capabilities & CAP_UNICODE) {
4388 /* must align unicode strings */
4389 *bcc_ptr = 0; /* null byte password */
4394 if (ses->server->sign)
4395 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4397 if (ses->capabilities & CAP_STATUS32) {
4398 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4400 if (ses->capabilities & CAP_DFS) {
4401 smb_buffer->Flags2 |= SMBFLG2_DFS;
4403 if (ses->capabilities & CAP_UNICODE) {
4404 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4406 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4407 6 /* max utf8 char length in bytes */ *
4408 (/* server len*/ + 256 /* share len */), nls_codepage);
4409 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4410 bcc_ptr += 2; /* skip trailing null */
4411 } else { /* ASCII */
4412 strcpy(bcc_ptr, tree);
4413 bcc_ptr += strlen(tree) + 1;
4415 strcpy(bcc_ptr, "?????");
4416 bcc_ptr += strlen("?????");
4418 count = bcc_ptr - &pSMB->Password[0];
4419 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4420 pSMB->hdr.smb_buf_length) + count);
4421 pSMB->ByteCount = cpu_to_le16(count);
4423 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4426 /* above now done in SendReceive */
4430 tcon->tidStatus = CifsGood;
4431 tcon->need_reconnect = false;
4432 tcon->tid = smb_buffer_response->Tid;
4433 bcc_ptr = pByteArea(smb_buffer_response);
4434 bytes_left = get_bcc(smb_buffer_response);
4435 length = strnlen(bcc_ptr, bytes_left - 2);
4436 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4442 /* skip service field (NB: this field is always ASCII) */
4444 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4445 (bcc_ptr[2] == 'C')) {
4446 cifs_dbg(FYI, "IPC connection\n");
4450 } else if (length == 2) {
4451 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4452 /* the most common case */
4453 cifs_dbg(FYI, "disk share connection\n");
4456 bcc_ptr += length + 1;
4457 bytes_left -= (length + 1);
4458 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4460 /* mostly informational -- no need to fail on error here */
4461 kfree(tcon->nativeFileSystem);
4462 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4463 bytes_left, is_unicode,
4466 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4468 if ((smb_buffer_response->WordCount == 3) ||
4469 (smb_buffer_response->WordCount == 7))
4470 /* field is in same location */
4471 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4474 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4477 cifs_buf_release(smb_buffer);
4481 static void delayed_free(struct rcu_head *p)
4483 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4484 unload_nls(sbi->local_nls);
4489 cifs_umount(struct cifs_sb_info *cifs_sb)
4491 struct rb_root *root = &cifs_sb->tlink_tree;
4492 struct rb_node *node;
4493 struct tcon_link *tlink;
4495 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4497 spin_lock(&cifs_sb->tlink_tree_lock);
4498 while ((node = rb_first(root))) {
4499 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4500 cifs_get_tlink(tlink);
4501 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4502 rb_erase(node, root);
4504 spin_unlock(&cifs_sb->tlink_tree_lock);
4505 cifs_put_tlink(tlink);
4506 spin_lock(&cifs_sb->tlink_tree_lock);
4508 spin_unlock(&cifs_sb->tlink_tree_lock);
4510 kfree(cifs_sb->mountdata);
4511 kfree(cifs_sb->prepath);
4512 call_rcu(&cifs_sb->rcu, delayed_free);
4516 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4519 struct TCP_Server_Info *server = ses->server;
4521 if (!server->ops->need_neg || !server->ops->negotiate)
4524 /* only send once per connect */
4525 if (!server->ops->need_neg(server))
4528 set_credits(server, 1);
4530 rc = server->ops->negotiate(xid, ses);
4532 spin_lock(&GlobalMid_Lock);
4533 if (server->tcpStatus == CifsNeedNegotiate)
4534 server->tcpStatus = CifsGood;
4537 spin_unlock(&GlobalMid_Lock);
4544 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4545 struct nls_table *nls_info)
4548 struct TCP_Server_Info *server = ses->server;
4550 ses->capabilities = server->capabilities;
4551 if (linuxExtEnabled == 0)
4552 ses->capabilities &= (~server->vals->cap_unix);
4554 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4555 server->sec_mode, server->capabilities, server->timeAdj);
4557 if (ses->auth_key.response) {
4558 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
4559 ses->auth_key.response);
4560 kfree(ses->auth_key.response);
4561 ses->auth_key.response = NULL;
4562 ses->auth_key.len = 0;
4565 if (server->ops->sess_setup)
4566 rc = server->ops->sess_setup(xid, ses, nls_info);
4569 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4575 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4577 vol->sectype = ses->sectype;
4579 /* krb5 is special, since we don't need username or pw */
4580 if (vol->sectype == Kerberos)
4583 return cifs_set_cifscreds(vol, ses);
4586 static struct cifs_tcon *
4587 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4590 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4591 struct cifs_ses *ses;
4592 struct cifs_tcon *tcon = NULL;
4593 struct smb_vol *vol_info;
4595 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4596 if (vol_info == NULL)
4597 return ERR_PTR(-ENOMEM);
4599 vol_info->local_nls = cifs_sb->local_nls;
4600 vol_info->linux_uid = fsuid;
4601 vol_info->cred_uid = fsuid;
4602 vol_info->UNC = master_tcon->treeName;
4603 vol_info->retry = master_tcon->retry;
4604 vol_info->nocase = master_tcon->nocase;
4605 vol_info->nohandlecache = master_tcon->nohandlecache;
4606 vol_info->local_lease = master_tcon->local_lease;
4607 vol_info->no_lease = master_tcon->no_lease;
4608 vol_info->resilient = master_tcon->use_resilient;
4609 vol_info->persistent = master_tcon->use_persistent;
4610 vol_info->no_linux_ext = !master_tcon->unix_ext;
4611 vol_info->linux_ext = master_tcon->posix_extensions;
4612 vol_info->sectype = master_tcon->ses->sectype;
4613 vol_info->sign = master_tcon->ses->sign;
4614 vol_info->seal = master_tcon->seal;
4616 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4622 /* get a reference for the same TCP session */
4623 spin_lock(&cifs_tcp_ses_lock);
4624 ++master_tcon->ses->server->srv_count;
4625 spin_unlock(&cifs_tcp_ses_lock);
4627 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4629 tcon = (struct cifs_tcon *)ses;
4630 cifs_put_tcp_session(master_tcon->ses->server, 0);
4634 tcon = cifs_get_tcon(ses, vol_info);
4636 cifs_put_smb_ses(ses);
4641 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4644 kfree(vol_info->username);
4645 kzfree(vol_info->password);
4652 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4654 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4657 /* find and return a tlink with given uid */
4658 static struct tcon_link *
4659 tlink_rb_search(struct rb_root *root, kuid_t uid)
4661 struct rb_node *node = root->rb_node;
4662 struct tcon_link *tlink;
4665 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4667 if (uid_gt(tlink->tl_uid, uid))
4668 node = node->rb_left;
4669 else if (uid_lt(tlink->tl_uid, uid))
4670 node = node->rb_right;
4677 /* insert a tcon_link into the tree */
4679 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4681 struct rb_node **new = &(root->rb_node), *parent = NULL;
4682 struct tcon_link *tlink;
4685 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4688 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4689 new = &((*new)->rb_left);
4691 new = &((*new)->rb_right);
4694 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4695 rb_insert_color(&new_tlink->tl_rbnode, root);
4699 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4702 * If the superblock doesn't refer to a multiuser mount, then just return
4703 * the master tcon for the mount.
4705 * First, search the rbtree for an existing tcon for this fsuid. If one
4706 * exists, then check to see if it's pending construction. If it is then wait
4707 * for construction to complete. Once it's no longer pending, check to see if
4708 * it failed and either return an error or retry construction, depending on
4711 * If one doesn't exist then insert a new tcon_link struct into the tree and
4712 * try to construct a new one.
4715 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4718 kuid_t fsuid = current_fsuid();
4719 struct tcon_link *tlink, *newtlink;
4721 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4722 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4724 spin_lock(&cifs_sb->tlink_tree_lock);
4725 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4727 cifs_get_tlink(tlink);
4728 spin_unlock(&cifs_sb->tlink_tree_lock);
4730 if (tlink == NULL) {
4731 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4732 if (newtlink == NULL)
4733 return ERR_PTR(-ENOMEM);
4734 newtlink->tl_uid = fsuid;
4735 newtlink->tl_tcon = ERR_PTR(-EACCES);
4736 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4737 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4738 cifs_get_tlink(newtlink);
4740 spin_lock(&cifs_sb->tlink_tree_lock);
4741 /* was one inserted after previous search? */
4742 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4744 cifs_get_tlink(tlink);
4745 spin_unlock(&cifs_sb->tlink_tree_lock);
4747 goto wait_for_construction;
4750 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4751 spin_unlock(&cifs_sb->tlink_tree_lock);
4753 wait_for_construction:
4754 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4755 TASK_INTERRUPTIBLE);
4757 cifs_put_tlink(tlink);
4758 return ERR_PTR(-ERESTARTSYS);
4761 /* if it's good, return it */
4762 if (!IS_ERR(tlink->tl_tcon))
4765 /* return error if we tried this already recently */
4766 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4767 cifs_put_tlink(tlink);
4768 return ERR_PTR(-EACCES);
4771 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4772 goto wait_for_construction;
4775 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4776 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4777 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4779 if (IS_ERR(tlink->tl_tcon)) {
4780 cifs_put_tlink(tlink);
4781 return ERR_PTR(-EACCES);
4788 * periodic workqueue job that scans tcon_tree for a superblock and closes
4792 cifs_prune_tlinks(struct work_struct *work)
4794 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4796 struct rb_root *root = &cifs_sb->tlink_tree;
4797 struct rb_node *node;
4798 struct rb_node *tmp;
4799 struct tcon_link *tlink;
4802 * Because we drop the spinlock in the loop in order to put the tlink
4803 * it's not guarded against removal of links from the tree. The only
4804 * places that remove entries from the tree are this function and
4805 * umounts. Because this function is non-reentrant and is canceled
4806 * before umount can proceed, this is safe.
4808 spin_lock(&cifs_sb->tlink_tree_lock);
4809 node = rb_first(root);
4810 while (node != NULL) {
4812 node = rb_next(tmp);
4813 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4815 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4816 atomic_read(&tlink->tl_count) != 0 ||
4817 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4820 cifs_get_tlink(tlink);
4821 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4822 rb_erase(tmp, root);
4824 spin_unlock(&cifs_sb->tlink_tree_lock);
4825 cifs_put_tlink(tlink);
4826 spin_lock(&cifs_sb->tlink_tree_lock);
4828 spin_unlock(&cifs_sb->tlink_tree_lock);
4830 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,